Document:

EX-10.12

 Exhibit 10.12 
 ENGILITY HOLDINGS, INC. 
 CHANGE IN CONTROL SEVERANCE PLAN 

THIS CHANGE IN CONTROL SEVERANCE PLAN, adopted on July 17, 2012 (the “Effective Date”) by ENGILITY HOLDINGS, INC.,
a Delaware corporation, has been established to provide for the payment of severance benefits to Employees (as defined below). 

Section 1. Definitions. Unless the context clearly indicates otherwise, when used in this Plan: 

(a) “Actual Bonus” means any Bonus actually paid or payable to an Eligible Employee (excluding any
reduction in amount resulting from an adverse change to the assumptions (including the Employee’s Target Bonus) or calculation methodology for determining the amount of such Bonus made on or after a Change in Control). 

(b) “Affiliate” means, with respect to any entity, any other corporation, organization, association,
partnership, sole proprietorship or other type of entity, whether incorporated or unincorporated, directly or indirectly controlling or controlled by or under direct or indirect common control with such entity. 

(c) “Annual Compensation” means the sum of (x) the greater of the Eligible Employee’s Base
Salary in effect (A) immediately prior to the date of the Change in Control or (B) immediately prior to the date of termination of the Eligible Employee (or, if the termination is for Good Reason, immediately prior to the event set forth
in the notice of termination given in accordance with Section 15 of this Plan), and (y) the Eligible Employee’s Average Bonus. 
 (d) “Anticipatory Termination” means a termination of an Employee made in connection with or in anticipation of a Change in Control at the request of, or upon the initiative of,
the acquiror in the Change in Control transaction or otherwise in connection with or anticipation of the Change in Control. 
 (e) “Average Bonus” means the average of all Bonuses paid or payable to an Eligible Employee in respect of the three Fiscal Years ended prior to the Fiscal Year in which the employment of
the Eligible Employee is terminated (or, if the Eligible Employee was not an Employee during each of such Fiscal Years, such lesser number of Fiscal Years during which the Eligible Employee was an Employee); provided that for purposes of calculating
“Average Bonus”: 
 (i) any pro-rated Bonus awarded to the Eligible Employee for a Fiscal Year in which
the Employee was employed for less than the full Fiscal Year shall be annualized; 
 (ii) if the Bonus for the
last of the three Fiscal Years utilized in this calculation (A) (x) has not been paid because the Employee was terminated prior to the scheduled date for payment of such Bonus and (y) is not determinable by

 
way of a formula or calculation applied on a basis consistent with past practice or (B) has been paid based on an adverse change to the assumptions (including the Employee’s Target
Bonus) or calculation methodology for determining the amount of such Bonus made on or after a Change in Control, then the Bonus for such year shall be disregarded and the calculation shall be made as if the Employee was not an Employee during such
Fiscal Year; 
 (iii) if the Eligible Employee was promoted to a more senior position in connection with the
spin-off of the Company on July 17, 2012, then the term “Average Bonus” shall be calculated as if the Employee was not an Employee during any Fiscal Year prior to 2012; and 

(iv) if the Eligible Employee was not an employee in a position eligible for a Bonus during any of the three previous
Fiscal Years then the term “Average Bonus” shall mean the Eligible Employee’s Target Bonus. 
 (f)
“Base Salary” means an Employee’s annual rate of base salary in effect on the date in question, determined on a “gross wages” basis (i.e. prior to reduction for any employee-elected salary reduction contributions made
to an Employer-sponsored non-qualified deferred compensation plan or an Employer-sponsored plan pursuant to Section 401(k) or 125 of the Code), and excluding bonuses, overtime, allowances, commissions, deferred compensation payments and any
other extraordinary remuneration. 
 (g) “Board” means the board of directors of the Company.

 (h) “Bonus Fraction” means, with respect to any Eligible Employee, a fraction, the numerator
of which shall equal the number of days the Eligible Employee was employed by the Eligible Employee’s Employer in the Fiscal Year in which the Eligible Employer’s termination occurs and the denominator of which shall equal 365. 

(i) “Bonus” means the amount payable to an Employee under the Employer’s applicable annual cash
incentive bonus plan with respect to a Fiscal Year. 
 (j) “Business Unit President” means any
President of a business unit of the Company or any of its wholly-owned subsidiaries who is also a CEO Direct Report. 
 (k) “Cause” means an Employee’s: 
 (1)
intentional failure to perform reasonably assigned duties, which failure Employee does not cure within fifteen days of the Company providing written notice of such failure; 

(2) personal dishonesty or willful misconduct in the performance of duties; 

(3) breach of fiduciary duties to the Company involving personal profit; 

  
 2 

 (4) willful violation of any law, rule or regulation in connection with the
performance of duties (other than traffic violations or similar offenses); or 
 (5) (a) any act by an Employee
involving fraud, (b) any breach by an Employee of applicable regulations of competent authorities in relation to trading or dealing with stocks, securities, investments and the like or (c) any willful or grossly negligent act by the
Employee resulting in an investigation by the Securities and Exchange Commission, which, in each of cases (a), (b) and (c) above, the Board determines in its sole and absolute discretion materially adversely affects the Company or the
Employee’s ability to perform his or her duties to the Company. 
 For purposes of this definition, an act, or failure to
act, on an Employee’s part shall be deemed “willful” if done, or omitted to be done, by the Employee in bad faith and without reasonable belief that the action or omission was in the best interest of the Company. 

(l) “CEO Direct Report” means any employee of the Company or any of its wholly-owned subsidiaries who
reports directly to the Chief Executive Officer of the Company. 
 (m) “CEO Indirect Report”
means any employee of the Company or any of its wholly-owned subsidiaries who reports directly to a CEO Direct Report. 
 (n) “Change in Control” means: 
 (1) the
acquisition by any person or group (including a group within the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act), other than the Company or any of its subsidiaries, of beneficial ownership (within the meaning of Rule 13d-3
promulgated under the Exchange Act) of a majority of the combined voting power of the Company’s then outstanding voting securities, other than by any employee benefit plan maintained by the Company; 

(2) the sale of all or substantially all the assets of the Company and its subsidiaries taken as a whole; or 

(3) the election, including the filling of vacancies, during any period of 24 months or less, of 50% or more of the
members of the Board, without the approval of Continuing Directors, as constituted at the beginning of such period. 
 (o) For purposes of this definition, “Continuing Directors” shall mean, with respect to any date, any director of the Company who either (i) is a member of the Board on July 18, 2012,
or (ii) is subsequently nominated for election to the Board by a majority of the Board which is comprised of directors who were, at the time of such nomination, Continuing Directors. 

(p) “Chief Executive Officer” means the Chief Executive Officer of the Company. 

  
 3 

 (q) “Chief Financial Officer” means the Chief Financial
Officer of the Company who is also a CEO Direct Report. 
 (r) “COBRA” means the Consolidated
Omnibus Budget Reconciliation Act of 1985, as amended. 
 (s) “Code” means the Internal Revenue
Code of 1986, as amended. 
 (t) “Committee” means the committee designated pursuant to
Section 6 to administer this Plan. 
 (u) “Company” means Engility Holdings, Inc., a
Delaware corporation and, after a Change in Control, any successor or successors thereto. 
 (v)
“Disability” means an Employee, as a result of incapacity due to physical or mental illness, becomes eligible for benefits under the long-term disability plan or policy of the Company or a subsidiary in which the Employee is
eligible to participate. 
 (w) “Eligible Employee” means an Employee whose employment with
Employee’s Employer (i) is terminated by the Employer for any reason other than Cause, Disability or death (A) as an Anticipatory Termination, but only (x) if an anticipated Change in Control actually occurs during the period in
which this Plan is effective and (y) to the extent such Change in Control also constitutes a change in ownership or effective control, or in the ownership of a substantial portion of the assets, within the meaning of
Section 409A(a)(2)(A)(v) of the Code or (B) during the two-year period beginning on the effective date of a Change in Control, or (ii) terminates during the two-year period beginning on the effective date of a Change in Control on
account of such Employee’s resignation for Good Reason within six months from the date the Employee first becomes actually aware of the existence of Good Reason. 

(x) “Employee” means any CEO Direct Report or CEO Indirect Report. 

(y) “Employer” means, with respect to any Employee, the legal entity that employed such Employee prior to
any termination of employment contemplated hereunder. 
 (z) “Exchange Act” means the Securities
Exchange Act of 1934, as amended. 
 (aa) “Executive” means a person qualifying as any of
following immediately prior to the date of a Change in Control: (i) the Chief Executive Officer, (ii) the Chief Financial Officer, (iii) any Senior Vice President, (iv) any Business Unit President and (v) any Vice President,
as defined in this Plan. 
 (bb) “Fiscal Year” means any given fiscal year of the Company.

  
 4 

 (cc) “Good Reason” means any of the following actions on or
after a Change in Control, without Employee’s express prior written approval, other than due to Employee’s Disability or death: 
 (1) (A) any reduction in Base Salary or annual or long-term incentive opportunity (including Target Bonus, if applicable) or (B) any adverse change to the calculation methodology for determining
Bonuses or long-term incentives which is reasonably likely to have an adverse impact on the amounts the Eligible Employee has the potential to earn under such programs (which for the avoidance of doubt shall not be deemed to have occurred if an
acquiror fails to continue or provide any equity-based incentive plan); 
 (2) any failure by acquiror to
continue to provide employee benefits that are substantially similar in the aggregate to those afforded to the Employee immediately prior to the Change in Control; for this purpose employee benefits shall mean retirement, fringe and welfare
benefits; 
 (3) any material adverse change in Employee’s duties or responsibilities; 

(4) any relocation of Employee’s principal place of business of 50 miles or more, provided that such
relocation also increases Employee’s commute by at least 25 miles; or 
 (5) any failure to pay
Employee’s Base Salary and other amounts earned by Employee within ten (10) days after the date such compensation is due; 
 (6) the failure of any successor or assignee (whether direct or indirect, by purchase, merger, consolidation, or otherwise) to all or substantially all of the business and/or assets of the Company in
connection with any Change in Control, by agreement in writing in form and substance reasonably satisfactory to Employee, expressly, absolutely and unconditionally to assume and agree to perform all obligations under this Plan. 

(dd) “Plan” means the Engility Holdings, Inc. Change in Control Severance Plan, as in effect from time to
time. 
 (ee) “Plan Year” means the calendar year. 

(ff) “Release” means a release to be signed by an Eligible Employee in such form as the Company shall
reasonably determine, which shall, to the extent permitted by law, waive all claims and actions against the Employers and such other related parties and entities as the Company reasonably chooses to include in the release except for claims and
actions for benefits provided under (or contemplated by) the terms of this Plan (which Release is not revoked by the Eligible Employee). 
 (gg) “Senior Vice President” means any Senior Vice President of the Company or any of its wholly-owned subsidiaries who is also a CEO Direct Report. 

  
 5 

 (hh) “Severance Multiple” means, with respect to any
Eligible Employee, the highest of the following multiples applicable to such person: 
 (1) the multiple of three
(3), for each of the Chief Executive Officer and the Chief Financial Officer; 
 (2) the multiple of two and
one-half (2.5), for each Senior Vice President or Business Unit President; 
 (3) the multiple of two (2), for
each Vice President of the Company who is a CEO Direct Report; and 
 (4) the multiple of one and one-half (1.5),
for each Vice President who is a CEO Indirect Report. 
 (ii) “Target Bonus” means the greater
of (1) an Employee’s target Bonus in effect immediately prior to the date of the Change in Control or (2) an Employee’s target Bonus in effect immediately prior to the date on which the Eligible Employee is terminated (or, if the
termination is for Good Reason, immediately prior to the event set forth in the notice of termination given in accordance with Section 15). 
 (jj) “Vice President” means any Vice President of the Company or any of its wholly-owned subsidiaries who is either a CEO Direct Report or a CEO Indirect Report. 

Section 2. Severance Benefits. Each Eligible Employee who executes a Release in the manner prescribed by the Company within
45 days following such Eligible Employee’s date of termination and additionally, for each Executive other than a CEO Indirect Report, who agrees at such time to be subject to the restrictive covenants set forth on Exhibit A shall be
entitled to the following: 
 (a) Severance Pay. 

(1) Each such Eligible Employee who is an Executive shall be entitled to receive severance pay from his or her Employer in
a lump sum amount equal to the sum of: 
 (i) the Eligible Employee’s Severance Multiple, multiplied
by the Eligible Employee’s Annual Compensation; and 
 (ii) either: (a) if determinable on the date of
termination (i.e., by way of a formula or calculation applied on a basis consistent with past practice), the Actual Bonus for the Eligible Employee’s actual period of service during the year of termination, or (b) the Average Bonus
multiplied by the Bonus Fraction. 
 (2) Each such Eligible Employee who is not an Executive shall be
entitled to receive severance pay from his or her Employer in a lump sum amount equal to the sum of: 
 (i)
either: (a) if determinable on the date of termination (i.e., by way of a formula or calculation applied on a basis consistent with past 

  
 6 

 
practice), the Actual Bonus for the Eligible Employee’s actual period of service during the year of termination, or (b) the Average Bonus multiplied by the Bonus Fraction; plus

 (ii) four (4) weeks of the Eligible Employee’s Annual Compensation; plus 

(iii) two (2) or three (3) weeks (as determined by the Chief Executive Officer of the Company on or prior to
the date of the Change in Control) of the Eligible Employee’s Annual Compensation for each completed year of service by the Eligible Employee with the Company, its Affiliates and any of their respective predecessor entities; provided,
however, that the sum of the amounts determined under clauses (ii) and (iii) above shall be limited to the amount of the Eligible Employee’s Annual Compensation (i.e., 52 weeks of the Eligible Employee’s Annual
Compensation). 
 (b) Medical, Dental and Life Insurance Benefit Continuation. 

(1) For each Eligible Employee who is an Executive, for a period of years (or fractions thereof) equal to the Severance
Multiple following the Eligible Employee’s termination of employment (the “Executive Welfare Continuation Period”), the Eligible Employee and such Eligible Employee’s spouse and dependents (each as defined under the
applicable program) shall receive the following benefits: (x) medical and dental insurance coverages at the same benefit levels as provided to the Eligible Employee immediately prior to the Change in Control, for which the Company will
(A) reimburse the Eligible Employee during the first 18 months of the Executive Welfare Continuation Period or, if shorter, the period of actual COBRA continuation coverage received by the Eligible Employee during the Executive Welfare
Continuation Period, for the total amount of the monthly COBRA medical and dental insurance premiums payable by the Eligible Employee for such continued benefits in excess of the cost the Eligible Employee paid for such coverage (on a monthly
premium basis) immediately prior to such termination of employment and (B) provide such coverage for any remaining portion of the Executive Welfare Continuation Period at the same cost to the Eligible Employee as is generally provided to
similarly situated active employees of the Company (or, if it is not possible, or is cost-prohibitive for the Company to provide such coverage for such remaining portion, the Company will pay the Eligible Employee a cash lump sum payment equal to
the premiums the Company would have paid if the Eligible Employee had remained an active employer, subject to Section 4 hereof), provided, however, that if, during the Executive Welfare Continuation Period, the Eligible Employee
becomes employed by a new employer, continuing medical and dental coverage from the Company will become secondary to any coverage afforded by the new employer in which the Eligible Employee becomes enrolled); and (y) life insurance coverage at
the same benefit level as provided to the Eligible Employee immediately prior to the Change in Control and at the same cost to the Eligible 

  
 7 

 
Employee as is generally provided to similarly situated active employees of the Company (or if such coverage is no longer provided by the Company, then at the Employee’s cost immediately
prior to the Change in Control). 
 (2) For each Eligible Employee who is not an Executive, for a period not to
exceed the number of weeks of Annual Compensation payable to the Eligible Employee pursuant to Section 2(a)(2) above, (the “Employee Welfare Continuation Period”), the Eligible Employee and such Eligible Employee’s spouse
and dependents (each as defined under the applicable program) shall receive the following benefits: (x) medical and dental insurance coverages at the same benefit levels as provided to the Eligible Employee immediately prior to the Change in
Control, for which the Company will reimburse the Eligible Employee during the first 52 weeks of the Employee Welfare Continuation Period or, if shorter, the period of actual COBRA continuation coverage received by the Eligible Employee during the
Employee Welfare Continuation Period, for the total amount of the monthly COBRA medical and dental insurance premiums payable by the Eligible Employee for such continued benefits in excess of the cost the Eligible Employee paid for such coverage (on
a monthly premium basis) immediately prior to such termination of employment, provided, however, that if, during the Employee Welfare Continuation Period, the Eligible Employee becomes employed by a new employer, continuing medical and
dental coverage from the Company will become secondary to any coverage afforded by the new employer in which the Eligible Employee becomes enrolled); and (y) life insurance coverage at the same benefit level as provided to the Eligible Employee
immediately prior to the Change in Control and at the same cost to the Eligible Employee as is generally provided to similarly situated active employees of the Company (or if such coverage is no longer provided by the Company, then at the
Employee’s cost immediately prior to the Change in Control). 
 (c) Outplacement. Such Eligible
Employee shall receive reasonable outplacement services to be provided by a provider selected by such Eligible Employee, the cost of which shall be borne by the Company. 

(d) Accrued Benefits. Such Eligible Employee shall be entitled to receive any unpaid Base Salary through the date
of such Eligible Employee’s termination, any Bonus earned but unpaid as of the date of such Eligible Employee’s termination for any previously completed Fiscal Year (which, if not determinable by way of a formula or calculation applied on
a basis consistent with past practice, shall be an amount equal to the Eligible Employee’s Average Bonus), and all compensation previously deferred by such Eligible Employee but not yet paid as well as all accrued interest thereon. In addition,
such Eligible Employee shall be entitled to prompt reimbursement of any unreimbursed expenses properly incurred by such Eligible Employee in accordance with Company policies prior to the date of such Eligible Employee’s termination. Such
Eligible Employee shall also be able to receive and enjoy such other benefits, if any, to which such Eligible Employee may be entitled pursuant to the terms and conditions of (1) the employee compensation, incentive, equity, benefit or fringe
benefit plans, policies or programs of the Company, other than any Company severance policy and as provided in Section 12(a) of this Plan, and (2) the indemnification and D&O insurance plans, policies or programs of the Company.

  
 8 

 Section 3. Form and Time of Payment. The cash severance pay benefits payable to
an Eligible Employee under Section 2 above shall be paid to such Eligible Employee in a single lump sum less applicable withholdings under Section 4 of this Plan within 75 days after the Eligible Employee’s date of termination,
except with respect to any additional bonus amount payable after such time period to the extent required pursuant to Section 2(d) above and except as provided pursuant to Sections 4 and 5 of this Plan; provided, however, that the
Company shall not be required to pay or continue to pay the cash severance pay benefits in the event such Eligible Employee does not sign a Release or such Eligible Employee revokes the Release during the time to revoke, if any; and provided,
further, that if the designated period for executing such a Release spans two calendar years, the cash severance pay benefits payable under Section 2 above shall be paid to such Eligible Employee in the second calendar year. 

Section 4. Tax Withholding and Section 409A. Each Employer shall withhold from any amount payable to an Eligible
Employee pursuant to this Plan, and shall remit to the appropriate governmental authority, any income, employment or other tax the Employer is required by applicable law to so withhold from and remit on behalf of such Eligible Employee.
Notwithstanding any other provision of this Plan or certain compensation and benefit plans of the Employer, any payments or benefits due under this Plan or such Employer compensation and benefit plans upon or in connection with a termination of an
Eligible Employee’s employment shall be paid, and this Plan shall be interpreted, in a manner that shall ensure that any such payments or benefits shall not be subject to any tax or interest under Section 409A of the Code (including, for
the avoidance of doubt, by requiring that the payment of any severance due under Section 2 of this Plan to an Employee who is a “specified employee” within the meaning of the Section 409A of the Code be deferred until the date
that is six months following such termination of the Employee’s employment, to the extent such delay is required to comply with Section 409A of the Code). Each payment made under this Plan shall be designated as a “separate
payment” within the meaning of Section 409A of the Code. To the extent any reimbursements or in-kind benefits due to an Employee under this Plan constitute “deferred compensation” under Section 409A of the Code, any such
reimbursements or in-kind benefits shall be paid to such Employee in a manner consistent with Treas. Reg. Section 1.409A-3(i)(1)(iv). To the extent necessary to comply with Section 409A, in the event a transaction or series of transactions
is a Change in Control under this Plan but is not also a “change in the ownership of the Company,” a “change in the effective control of the Company,” or a “change in the ownership of a substantial portion of the
Company’s assets,” as such terms are defined in Section 1.409A-3(i)(5) of the Treasury Regulations, the benefits set forth in Section 2 shall be paid at such time and in such form as required by Section 409A of the Code.
Notwithstanding the foregoing, neither the Company nor any of its employees or representatives shall have any liability to any Eligible Employee to the extent that any payment or benefit hereunder is determined to be subject to any tax or interest
under Section 409A of the Code. 
 Section 5. Limitation of Certain Payments. 

(a) In the event the Company determines, based upon the advice of the independent public accountants for the Company, that
part or all of the consideration, 

  
 9 

 
compensation or benefits to be paid to an Employee under this Plan constitute “parachute payments” under Section 280G(b)(2) of the Code, as amended, then, if the aggregate present
value of such parachute payments, singularly or together with the aggregate present value of any consideration, compensation or benefits to be paid to Employee under any other plan, arrangement or agreement which constitute “parachute
payments” (collectively, the “Parachute Amount”) exceeds 2.99 times the Employee’s “base amount,” as defined in Section 280G(b)(3) of the Code (the “Employee Base Amount”), the
amounts constituting “parachute payments” which would otherwise be payable to or for the benefit of Employee shall be reduced to the extent necessary so that the Parachute Amount is equal to 2.99 times the Employee Base Amount (the
“Reduced Amount”); provided that such amounts shall not be so reduced if the Company determines, based upon the advice of an independent nationally recognized public accounting firm (which may, but need not be the independent
public accountants of the Company), that without such reduction Employee would be entitled to receive and retain, on a net after-tax basis (including, without limitation, any excise taxes payable under Section 4999 of the Code), an amount which
is greater than the amount, on a net after tax basis, that the Employee would be entitled to retain upon his receipt of the Reduced Amount. 
 (b) If the determination made pursuant to clause (a) of this Section 5 results in a reduction of the payments that would otherwise be paid to Employee except for the application of
clause (a) of this Section 5, the reduction shall be made in the following order: (a) first, any stock options whose exercise price is less than the fair market value of the Company’s stock in a transaction subject to
Section 280G of the Code shall be cancelled, and (b) second, cash payments set forth in Section 2(a) shall be reduced, each to the minimum extent as required by the operation of this Section 5, and such reductions shall be made
otherwise in a manner consistent with the requirements of Section 409A of the Code. Determinations hereunder shall take into account the exclusion for reasonable compensation for services to be rendered (including agreements not to render
services) after a change in control in accordance with Section 280G of the Code. 
 (c) As a result of
potential uncertainty in the application of Section 280G of the Code at the time of a determination hereunder, it is possible that payments will be made by the Employer which should not have been made under clause (a) of this
Section 5 (“Overpayment”) or that additional payments which are not made by the Employer pursuant to clause (a) of this Section 5 should have been made (“Underpayment”). In the event that there is a
final determination by the Internal Revenue Service, or a final determination by a court of competent jurisdiction, that an Overpayment has been made, any such Overpayment shall be repaid by Employee to the Employer together with interest at the
applicable Federal rate provided for in Section 7872(f)(2) of the Code. In the event that there is a final determination by the Internal Revenue Service, a final determination by a court of competent jurisdiction or a change in the provisions
of the Code or regulations pursuant to which an Underpayment arises under this Plan, any such Underpayment shall be promptly paid by the Employer to or for the benefit of Employee, together with interest at the applicable Federal rate provided for
in Section 7872(f)(2) of the Code. 

  
 10 

 Section 6. Plan Administration. This Plan shall be administered by the
Compensation Committee of the Board or, following a Change in Control, such other successor body as is designated by the acquiror in the Change in Control transaction (the “Committee”). Subject to the provisions of Section 7 of
this Plan, the Committee shall have discretionary and final authority to interpret and implement the provisions of this Plan and to determine eligibility for benefits under the Plan. The Committee shall perform all of the duties and exercise all of
the powers and discretion that the Committee deems necessary or appropriate for the proper administration of this Plan. The Committee may adopt such rules and regulations for the administration of this Plan as are consistent with the terms hereof,
and shall keep adequate records of its proceedings and acts. The Committee may employ such agents, accountants and legal counsel (who may be agents, accountants and legal counsel for an Employer) as may be appropriate for the administration of the
Plan. All reasonable administration expenses incurred by the Committee in connection with the administration of the Plan shall be paid by the Employer. 
 Section 7. Dispute Resolution. Any dispute hereunder or with regard to any document or agreement referred to herein shall be resolved by arbitration before the American Arbitration Association
in New York City, New York. The determination of the arbitrator shall be final and binding on the parties hereto and may be entered in any court of competent jurisdiction. 
 Section 8. Applicable Law. This Plan shall be governed and construed in accordance with applicable federal law; provided, however, that wherever such law does not otherwise preempt state law,
the laws of the State of New York shall govern. 
 Section 9. Legal Fees. All reasonable legal fees and expenses
incurred by an Eligible Employee in connection with any non-frivolous claim made pursuant to this Plan shall be borne by the Company. 
 Section 10. Plan Amendment and Termination. Prior to the occurrence of a Change in Control, each of the Board and the Committee shall have the right and power at any time, and from time to
time, subject to thirty (30) days advance written notice to all Employees (which notice requirement may be satisfied by a public filing with the SEC on Form 8-K or otherwise), to amend or terminate this Plan, in whole or in part;
provided, that no such amendment or termination shall be effective if made in connection with or in anticipation of a Change in Control at the request of, or upon the initiative of, the acquiror in the Change in Control transaction or
otherwise in connection with or anticipation of the Change in Control. After the occurrence of a Change in Control and during the two-year period beginning on the effective date of the Change in Control, this Plan may not be amended in a manner that
would materially, adversely affect Employees’ rights under the Plan or terminated without the consent of a majority of the Employees who are employed by an Employer at the time of the proposed amendment or termination or who are Eligible
Employees receiving severance benefits pursuant to Section 2 of this Plan at such time. Any action to amend or terminate this Plan on or after the date on which a Change in Control occurs, without the foregoing consent, shall not be effective
prior to the end of the two-year period beginning on the effective date of the Change in Control. 

  
 11 

 Section 11. Nature of Plan and Rights. This Plan is an unfunded employee welfare
benefit plan and no provision of this Plan shall be deemed or construed to create a trust fund of any kind or to grant a property interest of any kind to any Employee or former Employee. Any payment which becomes due under this Plan to an Eligible
Employee shall be made by his or her Employer out of its general assets, and the right of any Eligible Employee to receive a payment hereunder from his or her Employer shall be no greater than the right of any unsecured general creditor of such
Employer. 
 Section 12. Entire Agreement; Offset; No Interference. 

(a) This Plan constitutes the entire agreement between the parties and, except as expressly provided herein, supersedes
the provisions of all other prior agreements expressly concerning the payment of severance benefits upon a termination of employment in connection with or following a Change in Control; provided, that in no event shall payments or benefits
provided pursuant to any other severance agreement or policy entitle Employee to a duplication of payments and benefits pursuant to this Plan and, in the event of an Anticipatory Termination, any amount payable hereunder shall be offset and reduced
by the amount of any termination payments or benefits previously provided to Employee under any other severance arrangement with the Company. 
 (b) Except as expressly provided herein, this Plan shall not interfere in any way with the right of the Company to reduce Employee’s compensation or other benefits or terminate Employee’s
employment, with or without Cause. Any rights that Employee shall have in that regard shall be as set forth in any applicable employment agreement between Employee and the Company. 

Section 13. Anticipatory Changes. Notwithstanding any provision in this Agreement to the contrary, no Employee shall suffer
any reduction in the level of protections or benefits that would otherwise be enjoyed by the Employee hereunder as a result of any adverse change (including without limitation any such change in Base Salary; Target Bonus; assumptions or calculation
methodology used for determining Actual Bonus; insurance coverages; or rank or status as an Executive or Employee), made in connection with or in anticipation of a Change in Control at the request of, or upon the initiative of, the acquiror in the
Change in Control transaction or otherwise in connection with or anticipation of the Change in Control (each, an “Anticipatory Change”). In the event of any such Anticipatory Change, the provisions of this Agreement shall be
applied, and any amounts under this Agreement shall be calculated, as if such Anticipatory Change had not occurred. 

Section 14. Spendthrift Provision. No right or interest of an Eligible Employee under this Plan may be assigned, transferred
or alienated, in whole or in part, either directly or by operation of law, and no such right or interest shall be liable for or subject to any debt, obligation or liability of such Eligible Employee. 

Section 15. Notice. Notice of termination for Cause or for Good Reason shall be given in accordance with this Section, and
shall indicate the specific termination provision under the Plan relied upon, the relevant facts and circumstances and the effective date of termination. For the purpose of this Plan, any notice and all other communication provided for in this Plan

  
 12 

 
shall be in writing and shall be deemed to have been duly given when received at the respective addresses set forth below, or to such other address as the Company or the Eligible Employee may
have furnished to the other in writing in accordance herewith. 
 If to the Company: 

Engility Holdings, Inc. 
 3750 Centerview Drive 
 Chantilly, VA 20151 

If to Employee: 

To the most recent address of Employee set forth in the personnel records of the Company. 

Section 16. Effectiveness. This Plan shall be effective as of the Effective Date and reflects those amendments made as of
December 27, 2012. The Plan shall remain in effect until terminated pursuant to Section 10 of this Plan. 
  

					
	ENGILITY HOLDINGS, INC.
		
	By:	 	 /s/ Thomas O. Miiller

		 	Name:	 	Thomas O. Miiller
		 	Title:	 	Senior Vice President, General Counsel and Corporate Secretary

  
 13 

 Exhibit A 
 CONFIDENTIALITY AND NON-COMPETITION RESTRICTIVE COVENANTS 
 I. While employed by the
Company, and at any time thereafter, no Eligible Employee shall, without the prior written consent of the Company, use, divulge, disclose or make accessible to any other person, firm, partnership, corporation or other entity any Confidential
Information pertaining to the business of the Company or any of its affiliates, except when required to do so by applicable law, by a court, by any governmental agency, or by any administrative body or legislative body (including a committee
thereof); provided, however, that the Eligible Employee shall give reasonable notice under the circumstances to the Company that he or she has been notified that he or she will be required to so disclose as soon as possible after receipt of such
notice in order to permit the Company to take whatever action it reasonably deems necessary to prevent such disclosure and the Eligible Employee shall cooperate with the Company to the extent that it reasonably requests him or her to do so. For
purposes of this paragraph I, “Confidential Information” shall mean non-public information concerning the financial data, strategic business plans, product development (or other proprietary product data), customer lists, marketing plans
and other non-public, proprietary and confidential information of the Company, its subsidiaries, its affiliates or customers, that, in any case, is not otherwise available to the public (other than by the Eligible Employee’s breach of the terms
hereof). 
 II. In consideration of the Company’s obligations under the Plan to which this Exhibit A is attached, each Eligible Employee
agrees that for a period of twelve (12) months after termination of employment with his or her Employer, without the prior written consent of the Board, and which period may be extended, at the Eligible Employee’s discretion, up to a
period of time commensurate with the Eligible Employee’s Severance Multiple as defined in the Plan, (A) he or she will not, directly or indirectly, either as principal, manager, agent, consultant, officer, stockholder, partner, investor,
lender or employee or in any other capacity, carry on, be engaged in or have any financial interest in, any (i) entity which is in Competition with the business of the Company or its subsidiaries or (ii) Competitive Activity and
(B) he or she shall not, on his or her own behalf or on behalf of any person, firm or company, directly or indirectly, solicit or offer employment to any person who is or has been employed by the Company or its subsidiaries at any time during
the twelve (12) months immediately preceding such solicitation. For purposes of this paragraph II: (a) an entity shall be deemed to be in “Competition” with the Company or its subsidiaries if it is principally involved in the
purchase, sale or other dealing in any property or the rendering of any service purchased, sold, dealt in or rendered by the Company or its subsidiaries as a part of the business of the Company or its subsidiaries within the same geographic area in
which the Company effects such sales or dealings or renders such services at the Relevant Date; and (b) “Competitive Activity” shall mean any business into which the Company or any of its subsidiaries has taken substantial steps to
engage, as of the Relevant Date, which would be deemed to be in Competition with the business of the Company or its subsidiaries if such steps had been completed prior to the Relevant Date; and (c) the term “Relevant Date” shall mean
the effective date of termination of Employee’s employment with his or her Employer. 

  
 A-1

 III. Notwithstanding anything contained in this Exhibit A, nothing herein shall (i) prohibit any
Eligible Employee from serving as an officer, employee or independent consultant of any business unit or subsidiary which would not otherwise be in Competition with the Company or its subsidiaries or a Competitive Activity, but which business unit
is a part of, or which subsidiary is controlled by, or under common control with, an entity that would be in competition with the Company or its subsidiaries, so long as the Eligible Employee does not engage in any activity which is in Competition
with any business of the Company or its subsidiaries or is otherwise a Competitive Activity or (ii) be construed so as to preclude the Eligible Employee from investing in any publicly or privately held company, provided the Eligible
Employee’s beneficial ownership of any class of such company’s securities does not exceed 5% of the outstanding securities of such class. 
 IV. In the event the Company determines that an Eligible Employee has breached the covenants contained in this Exhibit A, the Company may, in addition to pursuing any other remedies it may have in law or
in equity, cease making any payments otherwise required by this Plan and/or obtain an injunction against the Eligible Employee from any court having jurisdiction over the matter restraining any further violation of this Exhibit A by the Eligible
Employee. Further, if in the opinion of any court of competent jurisdiction any of the restraints identified herein is not reasonable in any respect, such court shall have the right, power and authority to excise or modify such provision or
provisions of this covenant as to the court shall appear not reasonable and to enforce the remainder of the covenant as so amended. 

  
 A-2EX-10.21

 Exhibit 10.21 
 ENGILITY HOLDINGS, INC. 
 SEVERANCE PLAN 

THIS SEVERANCE PLAN, adopted as of January 1, 2013 (the “Effective Date”) by ENGILITY HOLDINGS, INC., a Delaware
corporation, has been established to provide for the payment of severance benefits to Eligible Employees (as defined below). 

Section 1. Definitions. Unless the context clearly indicates otherwise, when used in this Plan: 

(a) “Affiliate” means, with respect to any entity, any other corporation, organization, association,
partnership, sole proprietorship or other type of entity, whether incorporated or unincorporated, directly or indirectly controlling or controlled by or under direct or indirect common control with such entity, but excluding any entity that is a
joint venture. 
 (b) “Annual Compensation” means the sum of (x) the Eligible
Employee’s Base Salary in effect immediately prior to the date of the Eligible Employee’s Separation from Service (or, if the termination is for Good Reason, immediately prior to the event set forth in the notice of termination given in
accordance with Section 15 of this Plan), and (y) the Eligible Employee’s Average Bonus. 
 (c)
“Average Bonus” means the average of all Bonuses paid or payable to an Eligible Employee in respect of the three Fiscal Years ended prior to the Fiscal Year in which the employment of the Eligible Employee is terminated (or, if the
Eligible Employee was not employed by the Company during each of such Fiscal Years, such lesser number of Fiscal Years during which the Eligible Employee was so employed); provided that for purposes of calculating “Average Bonus”:

 (i) any pro-rated Bonus awarded to the Eligible Employee for a Fiscal Year in which the Eligible Employee was
employed for less than the full Fiscal Year shall be annualized; 
 (ii) the Bonus for the last of the three
Fiscal Years utilized in this calculation shall be disregarded (and the Eligible Employee shall be treated as if he or she were not employed during such Fiscal Year) if the Bonus for that year (A) has not been paid because the Eligible Employee
was terminated prior to the scheduled date for payment of such Bonus or (B) was paid based on an adverse change to the assumptions (including the Eligible Employee’s Target Bonus) or calculation methodology for determining the amount of
such Bonus made in anticipation of a Separation from Service, then the Bonus for such year shall be disregarded and the calculation shall be made as if the Eligible Employee was not employed during such Fiscal Year; 

(iii) if the Eligible Employee was promoted to a more senior position in connection with the spin-off of the Company on
July 17, 2012, then the term “Average Bonus” shall be calculated as if the Eligible Employee was not employed during any Fiscal Year prior to 2012; and 

(iv) if the Eligible Employee was not an employee in a position eligible for a Bonus during any of the three previous
Fiscal Years then the term “Average Bonus” shall mean the Eligible Employee’s Target Bonus. 

 (d) “Base Salary” means an Eligible Employee’s annual
rate of base salary in effect on the date in question, determined on a “gross wages” basis (i.e. prior to reduction for any employee-elected salary reduction contributions made to an Employer-sponsored non-qualified deferred compensation
plan or an Employer-sponsored plan pursuant to Section 401(k) or 125 of the Code), and excluding bonuses, overtime, allowances, commissions, deferred compensation payments and any other extraordinary remuneration. 

(e) “Board” means the board of directors of the Company. 

(f) “Bonus Fraction” means, with respect to any Eligible Employee, a fraction, the numerator of which
shall equal the number of days the Eligible Employee was employed by the Eligible Employee’s Employer in the Fiscal Year in which the Eligible Employee’s termination occurs and the denominator of which shall equal 365. 

(g) “Bonus” means the amount payable to an Eligible Employee under the Company’s applicable annual
cash incentive bonus plan with respect to a Fiscal Year. 
 (h) “Cause” means an Eligible
Employee’s: 
 (1) intentional failure to perform reasonably assigned duties, which failure the Eligible
Employee does not cure within fifteen days of the Company providing written notice of such failure; 
 (2)
personal dishonesty or willful misconduct in the performance of duties; 
 (3) breach of fiduciary duties to the
Company involving personal profit; 
 (4) willful violation of any law, rule or regulation in connection with the
performance of duties (other than traffic violations or similar offenses); or 
 (5) (a) any act by an Eligible
Employee involving fraud, (b) any breach by an Eligible Employee of applicable regulations of competent authorities in relation to trading or dealing with stocks, securities, investments and the like or (c) any willful or grossly negligent
act by the Eligible Employee resulting in an investigation by the Securities and Exchange Commission, which, in each of cases (a), (b) and (c) above, the Board determines in its sole and absolute discretion materially adversely affects the
Company or the Eligible Employee’s ability to perform his or her duties to the Company. 

  
 2 

 For purposes of this definition, an act, or failure to act, on an Eligible Employee’s
part shall be deemed “willful” if done, or omitted to be done, by the Eligible Employee in bad faith and without reasonable belief that the action or omission was in the best interest of the Company. 

(i) “CEO Direct Report” means any employee of the Company or any of its wholly-owned subsidiaries who
reports directly to the Chief Executive Officer of the Company. 
 (j) “CEO Indirect Report”
means any employee of the Company or any of its wholly-owned subsidiaries who reports directly to a CEO Direct Report. 
 (k) “Change in Control Plan” means the Engility Holdings, Inc. Change in Control Severance Plan. 
 (l) “Chief Executive Officer” means the Chief Executive Officer of the Company. 
 (m) “Chief Financial Officer” means the Chief Financial Officer of the Company who is also a CEO Direct Report. 

(n) “COBRA” means the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended. 

(o) “Code” means the Internal Revenue Code of 1986, as amended. 

(p) “Committee” means the committee designated pursuant to Section 6 to administer this Plan.

 (q) “Company” means Engility Holdings, Inc., a Delaware corporation and, where the context
requires, any Affiliate thereof. 
 (r) “Disability” means an Eligible Employee, as a result of
incapacity due to physical or mental illness, becomes eligible for benefits under the long-term disability plan or policy of the Company or a subsidiary in which the Eligible Employee is eligible to participate. 

(s) “Eligible Employee” means a person qualifying as any of following immediately prior to such
person’s Separation from Service: (i) the Chief Executive Officer, (ii) the Chief Financial Officer, (iii) any Senior Vice President, and (iv) any Vice President, as defined in this Plan. 

(t) “Employer” means, with respect to any Eligible Employee, the legal entity that employed such person
prior to any termination of employment contemplated hereunder. 

  
 3 

 (u) “Fiscal Year” means any given fiscal year of the
Company. 
 (v) “Good Reason” means any of the following actions, without the Eligible
Employee’s express prior written approval, other than due to Disability or death: 
 (1) (A) any material
reduction in Base Salary or annual cash incentive opportunity (including Target Bonus, if applicable) or, in the case of a CEO Direct Report, long-term incentive opportunity or (B) any adverse change to the calculation methodology for
determining Bonuses or, in the case of a CEO Direct Report, long-term incentives, which in each case, is reasonably likely to have a material adverse impact on the amounts the Eligible Employee has the potential to earn under such programs;

 (2) subject to the terms and conditions of the applicable plan(s), any failure by the Company to continue to
provide employee benefits to the Eligible Employee that are substantially similar in the aggregate to those afforded to persons of comparable title and position of the Company; for this purpose employee benefits shall mean retirement, fringe and
welfare benefits; 
 (3) any material adverse change in the Eligible Employee’s duties or responsibilities;

 (4) any relocation of the Eligible Employee’s principal place of business of 50 miles or more,
provided that such relocation also increases the Eligible Employee’s commute by at least 25 miles; or 
 (5) any failure to pay the Eligible Employee’s Base Salary and other amounts earned by the Eligible Employee within ten (10) days after the date such compensation is due. 

An Eligible Employee must provide written notice to the Company pursuant to Section 15 hereof of the Eligible Employee’s intent
to resign for Good Reason within 45 days of the occurrence of an event described in subparagraphs (1) to (5) above (each, a “Good Reason Event”) in order for the Eligible Employee’s resignation for Good Reason to be
effective hereunder. Upon receipt of such notice, the Company shall have 30 days (the “Cure Period”) to rectify the Good Reason Event. If the Company fails to rectify the Good Reason Event prior to the expiration of the Cure Period,
then the Eligible Employee may terminate employment within 10 days following the expiration of the Cure Period and such termination will be considered for Good Reason. 

(w) “Plan” means this Engility Holdings, Inc. Severance Plan, as in effect from time to time. 

(x) “Release” means a release to be signed by an Eligible Employee in such form as the Company shall
reasonably determine, which shall, to the extent permitted by law, waive all claims and actions against the Company and such other related parties and entities as the Company reasonably chooses to include in the release except for claims and actions
for benefits provided under (or contemplated by) the terms of this Plan (which Release is not revoked by the Eligible Employee). 

  
 4 

 (y) “Senior Vice President” means any Senior Vice President
of the Company or any of its wholly-owned subsidiaries who is also a CEO Direct Report. 
 (z)
“Separation from Service” means a “separation from service” from the Company and all of its Affiliates within the meaning of Code Section 409A and the regulations promulgated thereunder, applying the default terms
thereof, and, for purposes of any such provision of this Agreement, references to a “termination,” “termination of employment” or like terms shall mean “separation from service.” 

(aa) “Severance Multiple” means, with respect to any Eligible Employee, the highest of the following
multiples applicable to such person: 
 (1) the multiple of two (2), for each of the Chief Executive Officer and
the Chief Financial Officer; 
 (2) the multiple of one and one-half (1.5), for each Senior Vice President; and

 (3) the multiple of one (1), for each Vice President of the Company who is a CEO Direct Report or a CEO
Indirect Report. 
 (bb) “Target Bonus” means an Eligible Employee’s target Bonus in effect
immediately prior to the date of the Eligible Employee’s Separation from Service (or, if the termination is for Good Reason, immediately prior to the event set forth in the notice of termination given in accordance with Section 15).

 (cc) “Vice President” means any Vice President of the Company or any of its wholly-owned
subsidiaries who is either a CEO Direct Report or a CEO Indirect Report. 
 Section 2. Severance
Benefits. Each Eligible Employee who executes a Release in the manner prescribed by the Company within 45 days following such Eligible Employee’s (i) involuntary Separation from Service initiated by the Company without Cause,
(ii) Separation from Service for Good Reason initiated by the Eligible Employee, or (iii) Separation from Service on account of death or Disability, and (such 45 day period, as extended by any revocation period applicable to a Release
executed on the 45th such day, the “Severance
Delay Period”) who agrees at such time to be subject to the restrictive covenants set forth on Exhibit A shall be entitled to the following: 
 (a) Severance Pay. Each such Eligible Employee shall be entitled to receive severance pay from the Company, payable as provided in Section 3, in an amount equal to the Eligible Employee’s
Severance Multiple, multiplied by the Eligible Employee’s Annual Compensation; 

  
 5 

 (b) Medical, Dental and Life Insurance Benefit Continuation. For each
Eligible Employee, for a period of years (or fractions thereof) equal to the Severance Multiple following the Eligible Employee’s Separation from Service (the “Employee Welfare Continuation Period”), the Eligible Employee and
such Eligible Employee’s spouse and dependents (each as defined under the applicable program) shall receive the following benefits: (x) medical and dental insurance coverages at the same benefit levels as provided to the Eligible Employee
immediately prior to the Separation from Service, for which the Company will (A) reimburse the Eligible Employee during the Employee Welfare Continuation Period or, if shorter, the period of actual COBRA continuation coverage received by the
Eligible Employee during the Employee Welfare Continuation Period, for the total amount of the monthly COBRA medical and dental insurance premiums payable by the Eligible Employee for such continued benefits in excess of the cost the Eligible
Employee paid for such coverage (on a monthly premium basis) immediately prior to such termination of employment and (B) provide such coverage for any remaining portion of the Employee Welfare Continuation Period at the same cost to the
Eligible Employee as is generally provided to similarly situated active employees of the Company (or, if it is not possible, or is cost-prohibitive for the Company to provide such coverage for such remaining portion, the Company will pay the
Eligible Employee an additional monthly amount, at the same time as cash severance payments are made pursuant to Section 3, of cash equal to the premiums the Company would have paid if the Eligible Employee had remained an active employee,
subject to Section 4 hereof), provided, however, that if, during the Employee Welfare Continuation Period, the Eligible Employee becomes employed by a new employer that provides medical and dental coverage, the Company’s
continuing medical and dental coverage (and any cash payments in lieu thereof) shall cease; and (y) life insurance coverage at the same benefit level as provided to the Eligible Employee immediately prior to the Separation from Service and at
the same cost to the Eligible Employee as is generally provided to similarly situated active employees of the Company. 
 (c) Equity Vesting. All stock options, restricted stock or restricted stock units of the Eligible Employee that are vested prior to the date of the Separation from Service shall be owned,
exercisable or payable in accordance with their terms. With respect to unvested stock options and unvested restricted stock and restricted stock units (that have not been previously forfeited), whose only vesting condition is the continued provision
of services to the Company (collectively, “Time-Based Awards”), a portion of each grant of Time-Based Awards shall vest equal to (i) the number of Time-Based Awards with respect to such grant, multiplied by a fraction, the
numerator of which is the full number of calendar months that elapsed between the grant date of such Time-Based Awards and the date of the Eligible Employee’s Separation from Service, and the denominator of which is the number of months between
the grant date of such Time-Based Awards and when the Time-Based Awards would have fully vested and no longer be subject to forfeiture. Time-Based Awards that are restricted stock or restricted stock units shall be settled in cash or shares of the
Company’s common stock at the Company’s sole discretion. The vesting set forth in this Section 2(c) of any Time-Based Awards shall be conditioned 

  
 6 

 
upon the Eligible Employee’s execution of a Release and shall be made upon the expiration of the Severance Delay Period. For the avoidance of doubt, the treatment of all equity awards
subject to performance-vesting requirements shall be determined solely in accordance with the terms of such awards. 
 (d) Outplacement. Eligible Employees shall receive reasonable outplacement services to be provided by a provider selected by such Eligible Employee during the applicable Severance Period, the cost
of which shall be borne by the Company. 
 (e) Accrued Benefits. Such Eligible Employee shall be entitled
to receive the following as accrued benefits: (i) any unpaid Base Salary through the date of such Eligible Employee’s Separation from Service, (ii) any earned but unpaid Bonus applicable to the fiscal year immediately preceding the
fiscal year in which the termination occurs, (iii) a pro rata Bonus (using the Bonus Fraction) for the fiscal year in which the termination occurs equal to the Bonus that the Eligible Employee would have received if his or her employment had
not terminated prior to the end of the fiscal year (e.g., after determining whether applicable performance goals have been achieved determined on a basis consistent with past practice), and (iv) all earned compensation previously deferred by
such Eligible Employee but not yet paid as well as all accrued interest thereon. The accrued Benefits described in this Section 2(f) shall be payable at such times as they were originally scheduled to have been made. In addition, such Eligible
Employee shall be entitled to prompt reimbursement of any unreimbursed expenses properly incurred by such Eligible Employee in accordance with Company policies prior to the date of such Eligible Employee’s termination. Such Eligible Employee
shall also be able to receive and enjoy such other benefits, if any, to which such Eligible Employee may be entitled pursuant to the terms and conditions of (1) the employee compensation, incentive, equity, benefit or fringe benefit plans,
policies or programs of the Company, other than any Company severance policy and as provided in Section 12(a) of this Plan, and (2) the indemnification and D&O insurance plans, policies or programs of the Company. 

Section 3. Form and Time of Payment. The cash severance pay benefits payable to an Eligible Employee under Section 2(a)
above shall be paid to such Eligible Employee in equal bi-weekly installments in the Company’s regular payroll cycle, beginning immediately following the sixtieth day following the Eligible Employee’s termination of employment, for a
number of years equal to the Severance Multiple applicable to such Eligible Employee, except as provided pursuant to Section 4 of this Plan; provided, however, that the Company shall not be required to pay or continue to pay the cash
severance pay benefits (or any other benefits) in the event such Eligible Employee does not sign a Release (and all applicable revocation periods shall have expired) prior to the end of the Severance Delay Period, or such Eligible Employee revokes
the Release during the time to revoke, if any. 
 Section 4. Tax Withholding. The Company shall withhold from any
amount payable to an Eligible Employee pursuant to this Plan, and shall remit to the appropriate governmental authority, any income, employment or other tax the Company is required by applicable law to so withhold from and remit on behalf of such
Eligible Employee. 

  
 7 

 Section 5. Section 409A. 

(a) Notwithstanding any other provision of this Plan, any payments or benefits due under this Plan upon or in connection
with a termination of an Eligible Employee’s employment shall be paid, and this Plan shall be interpreted, in a manner that shall reasonably ensure that any such payments or benefits shall not be subject to any tax or interest under
Section 409A of the Code. Each payment made under this Plan shall be designated as a “separate payment” within the meaning of Section 409A of the Code. 

(b) In furtherance of Section 5(a), in the event an Eligible Employee who is a “specified employee” within
the meaning of the Section 409A of the Code becomes entitled to the payment of any severance amounts under this Plan, such payment shall be deferred until the date that is six months following the termination of the Eligible Employee’s
employment, to the extent such delay is required to comply with Section 409A of the Code. 
 (c) To the
extent any reimbursements or in-kind benefits due to an Eligible Employee under this Plan constitute “deferred compensation” under Section 409A of the Code, any such reimbursements or in-kind benefits shall be paid to such Eligible
Employee in a manner consistent with Treas. Reg. Section 1.409A-3(i)(1)(iv). 
 (d) Notwithstanding the
foregoing, neither the Company nor any of its employees or representatives shall have any liability to any Eligible Employee to the extent that any payment or benefit hereunder is determined to be subject to any tax or interest under
Section 409A of the Code. 
 Section 6. Plan Administration. This Plan shall be administered by the
Compensation Committee of the Board (the “Committee”). Subject to the provisions of Section 7 of this Plan, the Committee shall have discretionary and final authority to interpret and implement the provisions of this Plan and
to determine eligibility for benefits under the Plan. The Committee shall perform all of the duties and exercise all of the powers and discretion that the Committee deems necessary or appropriate for the proper administration of this Plan and may,
in its discretion, delegate duties related to administering the Plan. The Committee may adopt such rules and regulations for the administration of this Plan as are consistent with the terms hereof, and shall keep adequate records of its proceedings
and acts. The Committee may employ such agents, accountants and legal counsel (who may be agents, accountants and legal counsel for an Employer) as may be appropriate for the administration of the Plan. All reasonable administration expenses
incurred by the Committee in connection with the administration of the Plan shall be paid by the Company. 
 Section 7.
Dispute Resolution. Any dispute hereunder or with regard to any document or agreement referred to herein shall be resolved by arbitration before the American Arbitration Association in Reston, Virginia. The determination of the arbitrator
shall be final and binding on the parties hereto and may be entered in any court of competent jurisdiction. 

  
 8 

 Section 8. Applicable Law. This Plan shall be governed and construed in
accordance with applicable federal law; provided, however, that wherever such law does not otherwise preempt state law, the laws of the Commonwealth of Virginia shall govern. 
 Section 9. Legal Fees. All reasonable legal fees and expenses incurred by an Eligible Employee in connection with any non-frivolous claim made pursuant to this Plan shall be borne by the
Company. 
 Section 10. Plan Amendment and Termination. The Company reserves the right to amend, modify, suspend or
terminate the Plan, in whole or in part, at any time, by action of the Committee; provided that no such amendment, modification, suspension or termination shall impair the rights of an Eligible Employee who has incurred a Separation from Service
described in Section 2(a) unless such amendment, modification, suspension or termination is agreed to in a writing signed by the Eligible Employee and the Company. Notwithstanding the foregoing, the Company must provide all Eligible Employees
with notice of its intention to terminate this Plan or amend this Plan in a manner that is materially adverse to all or any Eligible Employees, in each case in accordance with Section 15 of the Plan, 60 calendar days prior to such termination
or material amendment (which notice requirement may be satisfied by a public filing with the SEC on Form 8-K or otherwise). During the 60-day notice period, the Eligible Employees shall continue to participate in the Plan, without giving effect to
any materially adverse amendment. 
 Section 11. Nature of Plan and Rights. This Plan is an unfunded employee
welfare benefit plan and no provision of this Plan shall be deemed or construed to create a trust fund of any kind or to grant a property interest of any kind to any Eligible Employee or former Eligible Employee. Any payment which becomes due under
this Plan to an Eligible Employee shall be made by the Company out of its general assets, and the right of any Eligible Employee to receive a payment hereunder the Company shall be no greater than the right of any unsecured general creditor of the
Company. 
 Section 12. Entire Agreement; Offset; No Interference. 

(a) This Plan constitutes the entire agreement between the parties and, except as expressly provided herein, supersedes
the provisions of all other prior agreements expressly concerning the payment of severance benefits upon a Separation from Service of an Eligible Employee; provided, that except as otherwise provided herein, awards pursuant to equity plans of
the Company shall be subject to the relevant award agreements thereunder. 
 (b) Except as expressly provided
herein, this Plan shall not interfere in any way with the right of the Company to reduce the Eligible Employee’s compensation or other benefits or terminate the Eligible Employee’s employment, with or without Cause. Any rights that the
Eligible Employee shall have in that regard shall be as set forth in any applicable employment agreement between the Eligible Employee and the Company. 
 Section 13. Spendthrift Provision. No right or interest of an Eligible Employee under this Plan may be assigned, transferred or alienated, in whole or in part, either directly or by operation
of law, and no such right or interest shall be liable for or subject to any debt, obligation or liability of such Eligible Employee. 

  
 9 

 Section 14. Notice. Notice of termination for Cause or for Good Reason shall be
given in accordance with this Section, and shall indicate the specific termination provision under the Plan relied upon, the relevant facts and circumstances and the effective date of termination. For the purpose of this Plan, any notice and all
other communication provided for in this Plan shall be in writing and shall be deemed to have been duly given when received at the respective addresses set forth below, or to such other address as the Company or the Eligible Employee may have
furnished to the other in writing in accordance herewith. 
 If to the Company: 

Engility Holdings, Inc. 
 3750 Centerview Drive 
 Chantilly, VA 20151 

If to Eligible Employee: 
 To the most recent address of Eligible Employee set forth in the personnel records of the Company. 
 Section 15. Effect on Other Plans, Agreements and Benefits. 
 (a) Unless otherwise provided herein, nothing in this Plan shall prevent or limit an Eligible Employee’s continuing or future participation in any plan, program, policy or practice provided by the
Company or its Affiliates for which the Eligible Employee may qualify, nor, except as explicitly set forth in this Plan, shall anything herein limit or otherwise affect such rights as a Participant may have under any other contract or agreement with
the Company or any of its Affiliates. Any economic or other benefit to an Eligible Employee under this Plan, other than the Accrued Benefits, will not be taken into account in determining any benefits to which the Eligible Employee may be entitled
under any profit-sharing, retirement or other benefit or compensation plan maintained by the Company and its Affiliates, unless provided otherwise in any such plan. 

(b) Notwithstanding the foregoing provisions of Section 15(a), and except as specifically provided below, any
severance payments or benefits received by an Eligible Employee pursuant to this Plan shall be in lieu of any general severance policy or other severance plan maintained by the Company or its Affiliates (other than a stock option, restricted stock,
share or unit, performance share or unit, supplemental retirement, deferred compensation or similar plan or agreement which may contain provisions operative on a termination of the Eligible Employee’s employment or may incidentally refer to
accelerated vesting or accelerated payment upon a termination of employment); provided, however, that if an Eligible Employee incurs a Separation from Service in circumstances under which the Eligible Employee becomes entitled to severance
payments or benefits pursuant to the Change in Control Plan, then the Eligible Employee shall not be entitled to any 

  
 10 

 
severance payments or benefits under this Plan as a result of such Separation from Service and, in lieu of, and not in duplication of, any severance payments or benefits the Eligible Employee
would otherwise to be entitled to receive under the Plan, the Eligible Employee shall receive the severance payments or benefits to which the Eligible Employee is entitled under the Change in Control Plan, payable or provided under the terms, and
subject to the conditions, of the Change in Control Plan. Further, notwithstanding the foregoing provisions of Section 15(a), if an Eligible Employee incurs a Separation from Service in circumstances under which the Eligible Employee would
become entitled to severance payments or benefits both pursuant to this Plan and pursuant to such Eligible Employee’s Employment Agreement, then the Eligible Employee shall receive severance payments or benefits only under either the Plan or
the Eligible Employee’s Employment Agreement, whichever of those two arrangements would provide the Eligible Employee with the greater aggregate severance payments and benefits, payable or provided under the terms, and subject to the
conditions, of either the Plan or the Eligible Employee’s Employment Agreement, as applicable, and after application of Section 5 hereof. Any severance payments or benefits received by an Eligible Employee under the Plan pursuant to the
immediately preceding sentence shall be in lieu of, and not in duplication of, any severance payments or benefits the Eligible Employee would otherwise be entitled to receive under the Eligible Employee’s Employment Agreement; and any severance
payments or benefits received by an Eligible Employee under the Eligible Employee’s Employment Agreement pursuant to the immediately preceding sentence shall be in lieu of, and not in duplication of, any severance payments or benefits the
Eligible Employee would otherwise be entitled to receive under the Plan. 
 Section 16. Effectiveness. This Plan
shall be effective as of the Effective Date and shall remain in effect until terminated pursuant to Section 10 of this Plan. 
  

					
	ENGILITY HOLDINGS, INC.
		
	By:	 	 /s/ Thomas O. Miiller

		 	Name:	 	Thomas O. Miiller
		 	Title:	 	Senior Vice President, General Counsel and Corporate Secretary

  
 11 

 Exhibit A 
 CONFIDENTIALITY AND NON-COMPETITION RESTRICTIVE COVENANTS 
 I. While employed by the
Company, and at any time thereafter, no Eligible Employee shall, without the prior written consent of the Company, use, divulge, disclose or make accessible to any other person, firm, partnership, corporation or other entity any Confidential
Information pertaining to the business of the Company or any of its Affiliates, except when required to do so by applicable law, by a court, by any governmental agency, or by any administrative body or legislative body (including a committee
thereof); provided, however, that the Eligible Employee shall give reasonable notice under the circumstances to the Company that he or she has been notified that he or she will be required to so disclose as soon as possible after receipt of such
notice in order to permit the Company to take whatever action it reasonably deems necessary to prevent such disclosure and the Eligible Employee shall cooperate with the Company to the extent that it reasonably requests him or her to do so. For
purposes of this paragraph I, “Confidential Information” shall mean non-public information concerning the financial data, strategic business plans, product development (or other proprietary product data), customer lists, marketing plans
and other non-public, proprietary and confidential information of the Company, its Affiliates or customers, that, in any case, is not otherwise available to the public (other than by the Eligible Employee’s breach of the terms hereof).

 II. In consideration of the Company’s obligations under the Plan to which this Exhibit A is attached, each Eligible Employee agrees that
for a period of twelve (12) months after termination of employment with the Company, without the prior written consent of the Board, and which period may be extended, at the Eligible Employee’s discretion, up to a period of time
commensurate with the Eligible Employee’s Severance Multiple as defined in the Plan, (A) he or she will not, directly or indirectly, either as principal, manager, agent, consultant, officer, stockholder, partner, investor, lender or
employee or in any other capacity, carry on, be engaged in or have any financial interest in, any (i) entity which is in Competition with the business of the Company or its Affiliates or (ii) Competitive Activity and (B) he or she
shall not, on his or her own behalf or on behalf of any person, firm or company, directly or indirectly, solicit or offer employment to any person who is or has been employed by the Company or its Affiliates at any time during the twelve
(12) months immediately preceding such solicitation. For purposes of this paragraph II: (a) an entity shall be deemed to be in “Competition” with the Company or its Affiliates if it is principally involved in the purchase, sale
or other dealing in any property or the rendering of any service purchased, sold, dealt in or rendered by the Company or its Affiliates as a part of the business of the Company or its Affiliates within the same geographic area in which the Company
effects such sales or dealings or renders such services at the Relevant Date; and (b) “Competitive Activity” shall mean any business into which the Company or any of its Affiliates has taken substantial steps to engage, as of the
Relevant Date, which would be deemed to be in Competition with the business of the Company or its Affiliates if such steps had been completed prior to the Relevant Date; and (c) the term “Relevant Date” shall mean the effective date
of termination of Eligible Employee’s employment with the Company. 
 III. Non-Disparagement. As a condition of participation in
this Plan and the continued receipt of any benefits hereunder, each Eligible Employee agrees that, during his or her employment 

  
 A-1

 
with the Company or any of its Affiliates or at any time thereafter, the Eligible Employee shall not make, nor cause any one else to make or cause on the Eligible Employee’s behalf, any
public disparaging or derogatory statements or comments regarding the Company or its Affiliates, or their respective officers or directors. 

IV Employee’s Cooperation. During the term of an Eligible Employee’s employment, the period over which an Eligible Employee is receiving
payments hereunder, and a reasonable time thereafter, such Eligible Employee shall cooperate with the Company and its Affiliates in any disputes with third parties, internal investigation or administrative, regulatory or judicial proceeding as
reasonably requested by the Company (including, without limitation, the Eligible Employee being available to the Company upon reasonable notice for interviews and factual investigations, appearing at the Company’s request to give testimony
without requiring service of a subpoena or other legal process, volunteering to the Company all pertinent information and turning over to the Company all relevant documents which are or may come into the Eligible Employee’s possession, all at
times and on schedules that are reasonably consistent with the Eligible Employee’s other permitted activities and commitments). In the event the Company requires an Eligible Employee’s cooperation in accordance with this paragraph after
the term of an Eligible Employee’s employment, the Company shall reimburse the Eligible Employee for reasonable travel and other out-of-pocket expenses upon submission of receipts. 
 V. Notwithstanding anything contained in this Exhibit A, nothing herein shall (i) prohibit any Eligible Employee from serving as an officer, employee or independent consultant of any business unit or
subsidiary which would not otherwise be in Competition with the Company or its Affiliates or a Competitive Activity, but which business unit is a part of, or which subsidiary is controlled by, or under common control with, an entity that would be in
competition with the Company or its Affiliates, so long as the Eligible Employee does not engage in any activity which is in Competition with any business of the Company or its Affiliates or is otherwise a Competitive Activity or (ii) be
construed so as to preclude the Eligible Employee from investing in any publicly or privately held company, provided the Eligible Employee’s beneficial ownership of any class of such company’s securities does not exceed 5% of the
outstanding securities of such class. 
 VI. In the event the Company determines that an Eligible Employee has breached the covenants contained
in this Exhibit A, the Company may, in addition to pursuing any other remedies it may have in law or in equity, cease making any payments otherwise required by this Plan and/or obtain an injunction against the Eligible Employee from any court having
jurisdiction over the matter restraining any further violation of this Exhibit A by the Eligible Employee. Further, if in the opinion of any court of competent jurisdiction any of the restraints identified herein is not reasonable in any respect,
such court shall have the right, power and authority to excise or modify such provision or provisions of this covenant as to the court shall appear not reasonable and to enforce the remainder of the covenant as so amended. 

  
 A-2

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00214-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00214-of-00352.parquet"}]]