EX-10.17





 Exhibit 10.17 

November 23, 2020 
 Genesis Park Acquisition
Corp. 
 2000 Edwards St., Suite B 
 Houston, Texas 77007 

Re: Initial Public Offering 
 Ladies and Gentlemen: 

This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the
“Underwriting Agreement”) to be entered into by and between Genesis Park Acquisition Corp., a Cayman Islands exempted company (the “Company”), and Jefferies LLC, as representative (the
“Representative”) of the several underwriters (each, an “Underwriter” and collectively, the “Underwriters”), relating to an underwritten initial public offering (the
“Public Offering”), of up to 17,250,000 of the Company’s units (including up to 2,250,000 units that may be purchased to cover over-allotments, if any) (the “Units”), each comprised of one
Class A ordinary share of the Company, par value $0.0001 per share (the “Ordinary Shares”), and one-half of one redeemable warrant. Each whole warrant (each, a
“Warrant”) entitles the holder thereof to purchase one Ordinary Share at a price of $11.50 per share, subject to adjustment. The Units will be sold in the Public Offering pursuant to a registration statement on Form S-1 and prospectus (the “Prospectus”) filed by the Company with the Securities and Exchange Commission (the “Commission”), and the Units have been approved to be
listed on the New York Stock Exchange. Certain capitalized terms used herein are defined in paragraph 11 hereof. 
 In order to induce the
Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the Public Offering and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Genesis Park Holdings (the
“Sponsor”) and each of the undersigned individuals, each of whom is a member of the Company’s board of directors and/or management team (each, an “Insider” and collectively, the
“Insiders”), hereby agrees with the Company as follows: 
 1. The Sponsor and each Insider hereby agrees that if the
Company seeks shareholder approval of a proposed Business Combination, then in connection with such proposed Business Combination, it, he or she shall (i) vote any Shares owned by it, him or her in favor of such proposed Business Combination
and (ii) not redeem any Ordinary Shares owned by it, him or her in connection with such shareholder approval. If the Company engages in a tender offer in connection with any proposed Business Combination, each Insider agrees that he or she will
not seek to sell his or her Ordinary Shares to the Company in connection with such tender offer. 
 2. The Sponsor and each Insider hereby
agrees that in the event that the Company fails to consummate a Business Combination within the timeframe set forth in the Company’s amended and restated memorandum and articles of association, as amended from time to time (the
“Articles”), the Sponsor and each Insider shall take all reasonable steps to cause the Company to (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more
than 10 business days thereafter, subject to lawfully available funds therefor, redeem 100% of the Ordinary Shares sold as part of the Units in the Public Offering (the “Offering Shares”), at a
per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company
to pay its taxes (less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding Offering Shares, which redemption will completely extinguish all Public Shareholders’ rights as shareholders of the
Company (including the right to receive further liquidation distributions, if any), 












 
subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining shareholders and the Company’s
board of directors, dissolve and liquidate, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and other requirements of applicable law. The Sponsor and each Insider agree not to
propose any amendment to the Articles (a) to modify the substance or timing of the Company’s obligation to provide for the redemption of the Offering Shares in connection with an initial Business Combination or to redeem 100% of such
shares if the Company has not consummated an initial Business Combination within such time as is described in the Articles or (b) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity, unless the Company provides its Public Shareholders with the opportunity to redeem their Offering Shares upon approval of any such amendment at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to
pay its taxes, divided by the number of then outstanding Offering Shares. The Sponsor and each Insider agree to waive their respective redemption rights with respect to Shares owned by them in connection with a shareholder vote to approve an
amendment to the Articles (1) to modify the substance or timing of the Company’s obligation to provide for the redemption of the Offering Shares in connection with an initial Business Combination or to redeem 100% of such shares if the
Company has not consummated an initial Business Combination within such time as is described in the Articles or (2) with respect to any other material provisions relating to shareholders’ rights or
pre-initial Business Combination activity. 
 The Sponsor and each Insider acknowledges that it, he
or she has no right, title, interest or claim of any kind in or to any monies held in the Trust Account or any other asset of the Company as a result of any liquidation of the Company with respect to the Founder Shares held by it, him or her. The
Sponsor and each Insider hereby further waives, with respect to any Ordinary Shares held by it, him or her, if any, any redemption rights it, he or she may have in connection with the consummation of a Business Combination, including, without
limitation, any such rights available in the context of a shareholder vote to approve such Business Combination or in the context of a tender offer made by the Company to purchase Ordinary Shares (although the Sponsor, the Insiders and their
respective affiliates shall be entitled to redemption and liquidation rights with respect to any Offering Shares it or they hold if the Company fails to consummate a Business Combination within the timeframe set forth in the Articles). 

3. During the period commencing on the effective date of the Underwriting Agreement and ending 180 days after such date, the Sponsor and each
Insider shall not, without the prior written consent of the Representative, (i) sell, offer to sell, contract or agree to sell, hypothecate, pledge, grant any option to purchase or otherwise dispose of or agree to dispose of, directly or
indirectly, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”),
and the rules and regulations of the Commission promulgated thereunder, with respect to any Units, Shares, Warrants or any securities convertible into, or exercisable, or exchangeable for, Ordinary Shares owned by it, him or her, (ii) enter
into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any Units, Shares, Warrants or any securities convertible into, or exercisable, or exchangeable for, Ordinary Shares
owned by it, him or her, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (iii) publicly announce any intention to effect any transaction specified in clause (i) or (ii). Each of the
Insiders and the Sponsor acknowledges and agrees that, prior to the effective date of any release or waiver of the restrictions set forth in this paragraph 3 or paragraph 7 below, the Company shall announce the impending release or waiver by press
release through a major news service at least two business days before the effective date of the release or waiver. Any release or waiver granted shall only be effective two business days after the publication date of such press release. The
provisions of this paragraph will not apply if (i) the release or waiver is effected solely to permit a transfer of securities that is not for consideration and (ii) the transferee has agreed in writing to be bound by the same terms
described in this Letter Agreement to the extent and for the duration that such terms remain in effect at the time of the transfer. 

  
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 4. In the event of the liquidation of the Trust Account, the Sponsor (which, for purposes of
clarification, shall not extend to any other shareholders, members or managers of the Sponsor) agrees to indemnify and hold harmless the Company against any and all loss, liability, claim, damage and expense whatsoever (including, but not limited
to, any and all legal or other expenses reasonably incurred in investigating, preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever) to which the Company may become subject as a result of any claim by
(i) any third party (other than the Company’s independent public accountants) for services rendered or products sold to the Company or (ii) a prospective target business with which the Company has entered into a letter of intent,
confidentiality or other similar agreement for a Business Combination agreement (a “Target”); provided, however, that such indemnification of the Company by the Sponsor shall apply only to the extent necessary
to ensure that such claims by a third party for services rendered (other than the Company’s independent public accountants) or products sold to the Company or a Target do not reduce the amount of funds in the Trust Account to below the lesser
of (i) $10.15 per Offering Share or (ii) the actual amount per Offering Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.15 per Offering Share, due to reductions in the value of the trust
assets, less taxes payable, except as to any claims by a third party (including a Target) who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) and except as to any claims
under the Company’s indemnity of the Underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended. The Sponsor shall have the right to defend against any such claim with counsel of its choice
reasonably satisfactory to the Company if, within 15 days following written receipt of notice of the claim to the Sponsor, the Sponsor notifies the Company in writing that it shall undertake such defense. For the avoidance of doubt, none of the
Company’s officers or directors will indemnify the Company for claims by third parties, including, without limitation, claims by vendors and prospective Targets. 

5. To the extent that the Underwriters do not exercise their over-allotment option to purchase up to an additional 2,250,000 Units within 45
days from the date of the Prospectus (and as further described in the Prospectus), the Sponsor agrees to forfeit, at no cost, a number of Founder Shares in the aggregate equal to 562,500 multiplied by a fraction, (i) the numerator of which is
2,250,000 minus the number of Units purchased by the Underwriters upon the exercise of their over-allotment option, and (ii) the denominator of which is 2,250,000. The forfeiture will be adjusted to the extent that the over-allotment option is
not exercised in full by the Underwriters so that the Initial Shareholders will own an aggregate of 20.0% of the Company’s issued and outstanding Shares after the Public Offering. 

6. (a) Each Insider who is an officer of the Company hereby agrees not to become an officer or director of any other special purpose
acquisition company with a class of securities registered under the Exchange Act, until the Company has entered into a definitive agreement with respect to a Business Combination or unless the Company has failed to complete a Business Combination
within the timeframe set forth in the Articles. 
 (b) The Sponsor and each Insider hereby agrees and acknowledges that: (i) the
Underwriters and the Company would be irreparably injured in the event of a breach by the Sponsor or an Insider of its, his or her obligations under paragraphs 1, 2, 3, 4, 5, 6(a), 7(a), 7(b), and 9 of this Letter Agreement (ii) monetary
damages may not be an adequate remedy for such breach and (iii) the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such party may have in law or in
equity, in the event of such breach. 

  
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 7. (a) The Sponsor and each Insider agrees that it, he or she shall not Transfer any Founder
Shares (or Ordinary Shares issuable upon conversion thereof) until the earlier of (A) one year after the completion of the Company’s initial Business Combination or (B) subsequent to the Company’s initial Business Combination,
(x) if the reported closing price of the Ordinary Shares equals or exceeds $12.00 per share (as adjusted for share splits, share dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 180 days after the consummation of the Company’s initial Business Combination, or (y) the date on which the Company completes a liquidation, merger, capital share
exchange, reorganization or other similar transaction that results in all of the Company’s shareholders having the right to exchange their Ordinary Shares for cash, securities or other property (the “Founder Shares Lock-up Period”). 
 (b) The Sponsor and each Insider agrees that it, he or she shall not
Transfer any Private Placement Warrants (or Ordinary Shares issued or issuable upon the exercise of the Private Placement Warrants) until 30 days after the completion of a Business Combination (the “Private Placement Warrants Lock-up Period”, together with the Founder Shares Lock-up Period, the “Lock-up Periods”). 

(c) Notwithstanding the provisions set forth in paragraphs 7(a) and (b), Transfers of the Founder Shares, Private Placement Warrants and
Ordinary Shares issued or issuable upon the exercise or conversion of the Private Placement Warrants or the Founder Shares and that are held by the Sponsor, any Insider or any of their permitted transferees (that have complied with this paragraph
7(c)), are permitted (a) to the Company’s officers or directors, any affiliates or family members of any of the Company’s officers or directors, any members of the Sponsor or any affiliates of the Sponsor; (b) in the case of an
individual, by gift to a member of such individual’s immediate family or to a trust, the beneficiary of which is a member of such individual’s immediate family, an affiliate of such individual or to a charitable organization; (c) in
the case of an individual, by virtue of laws of descent and distribution upon death of such individual; (d) in the case of an individual, pursuant to a qualified domestic relations order; (e) by private sales or transfers made in
connection with any forward purchase agreement or similar arrangement or in connection with the consummation of an initial Business Combination at prices no greater than the price at which the shares or warrants were originally purchased;
(f) in the event of the Company’s liquidation prior to the completion of an initial Business Combination; or (g) by virtue of the laws of the Cayman Islands or the organizational documents of the Sponsor upon dissolution of the
Sponsor; provided, however, that in the case of clauses (a) through (e) or (g), these permitted transferees must enter into a written agreement with the Company agreeing to be bound by the transfer restrictions herein and the other restrictions
contained in this Agreement and by the same agreements entered into by the Sponsor with respect to such securities (including provisions relating to voting, the Trust Account and liquidating distributions). 

8. The Sponsor and each Insider represents and warrants that it, he or she has never been suspended or expelled from membership in any
securities or commodities exchange or association or had a securities or commodities license or registration denied, suspended or revoked. Each Insider’s biographical information furnished to the Company (including any such information included
in the Prospectus) is true and accurate in all respects and does not omit any material information with respect to the Insider’s background. The Sponsor and each Insider’s questionnaire furnished to the Company is true and accurate in all
respects. The Sponsor and each Insider represents and warrants that: it, he or she is not subject to or a respondent in any legal action for, any injunction,
cease-and-desist order or order or stipulation to desist or refrain from any act or practice relating to the offering of securities in any jurisdiction; it, he or she
has never been convicted of, or pleaded guilty to, any crime (i) involving fraud, (ii) relating to any financial transaction or handling of funds of another person, or (iii) pertaining to any dealings in any securities and it, he or
she is not currently a defendant in any such criminal proceeding. 

  
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 9. (a) Except as disclosed in the Prospectus, neither the Sponsor nor any Insider nor any
affiliate of the Sponsor or any Insider, nor any director or officer of the Company, shall receive from the Company any finder’s fee, reimbursement, consulting fee, monies in respect of any repayment of a loan or other compensation prior to, or
in connection with any services rendered in order to effectuate the consummation of the Company’s initial Business Combination (regardless of the type of transaction that it is), other than the following, none of which will be made from the
proceeds held in the Trust Account prior to the completion of the initial Business Combination: repayment of a loan and advances up to an aggregate of $300,000 made to the Company by the Sponsor; reimbursement for any
out-of-pocket expenses related to identifying, investigating and consummating an initial Business Combination; and repayment of loans, if any, and on such terms as to be
determined by the Company from time to time, made by the Sponsor or any of the Company’s officers or directors to finance transaction costs in connection with an intended initial Business Combination, provided, that, if the
Company does not consummate an initial Business Combination, a portion of the working capital held outside the Trust Account may be used by the Company to repay such loaned amounts so long as no proceeds from the Trust Account are used for such
repayment. Up to $1,500,000 of such loans may be convertible into warrants at a price of $1.00 per warrant at the option of the lender. Such warrants would be identical to the Private Placement Warrants, including as to exercise price,
exercisability and exercise period. 
 (b) Commencing on the effective date of the Prospectus for the Offering and continuing until the
earlier of (i) the consummation by the Company of a Business Combination or (ii) the Company’s liquidation as described in the Prospectus, Genesis Park II, LP, the managing member of the Sponsor, shall make available to the Company,
in an amount not to exceed $15,000 per month, certain office space and administrative and support services as may be required by the Company from time to time, situated at 2000 Edwards St., Suite B, Houston, TX 77007 (or any successor locations).

 10. The Sponsor and each Insider has full right and power, without violating any agreement to which it is bound (including, without
limitation, any non-competition or non-solicitation agreement with any employer or former employer), to enter into this Letter Agreement and, as applicable, to serve as
an officer and/or a director of the Company and hereby consents to being named in the Prospectus as an officer and/or a director of the Company. 

11. As used herein, (i) “Business Combination” shall mean a merger, share exchange, asset acquisition, share purchase,
reorganization or similar business combination, involving the Company and one or more businesses; (ii) “Shares” shall mean, collectively, the Ordinary Shares and the Founder Shares; (iii) “Founder
Shares” shall mean the 4,312,500 shares of the Company’s Class B ordinary shares, par value $0.0001 per share, held by the Sponsor (up to an aggregate of 562,500 shares of which are subject to complete or partial forfeiture by
the Sponsor if the over-allotment option is not exercised in full by the Underwriters); (iv) “Initial Shareholders” shall mean the Sponsor and any other holder of Founder Shares immediately prior to the Public Offering; (vi)
“Private Placement Warrants” shall mean the warrants to purchase up to an aggregate of 6,833,333 Ordinary Shares of the Company (or 7,562,689 Ordinary Shares if the over-allotment option is exercised in full) that the Sponsor
has agreed to purchase for an aggregate purchase price of $6,833,333 in the aggregate (or $7,562,689 if the over-allotment option is exercised in full), or $1.00 per warrant, in a private placement that shall occur simultaneously with the
consummation of the Public Offering; (vii) “Public Shareholders” shall mean the holders of securities issued in the Public Offering; (viii) “Trust Account” shall mean the trust fund into which a
portion of the net proceeds of the Public Offering and the sale of the Private Placement Warrants shall be deposited; and (ix) “Transfer” shall mean the (a) sale or assignment of, offer to sell, contract or agreement to
sell, hypothecate, pledge, grant of any option to purchase or otherwise dispose of or agreement to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to or decrease of a call
equivalent position within the meaning of Section 16 of the Exchange Act and the rules and regulations of the Commission promulgated thereunder with respect to, any security, (b) entry 

  
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into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any security, whether any such transaction is to be settled by
delivery of such securities, in cash or otherwise, or (c) public announcement of any intention to effect any transaction specified in clause (a) or (b). 

12. This Letter Agreement constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and
supersedes all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement may
not be changed, amended, modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument executed by all parties hereto. 

13. No party hereto may assign either this Letter Agreement or any of its rights, interests, or obligations hereunder without the prior
written consent of the other parties. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee. This Letter Agreement shall be
binding on the Sponsor and each Insider and their respective successors, heirs and assigns and permitted transferees. 
 14. Nothing in this
Letter Agreement shall be construed to confer upon, or give to, any person or corporation other than the parties hereto any right, remedy or claim under or by reason of this Letter Agreement or of any covenant, condition, stipulation, promise or
agreement hereof. All covenants, conditions, stipulations, promises and agreements contained in this Letter Agreement shall be for the sole and exclusive benefit of the parties hereto and their successors, heirs, personal representatives and assigns
and permitted transferees. 
 15. This Letter Agreement may be executed in any number of original or facsimile counterparts and each of such
counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. 

16. This Letter Agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect
the validity or enforceability of this Letter Agreement or of any other term or provision hereof. Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties hereto intend that there shall be added as a part of this
Letter Agreement a provision as similar in terms to such invalid or unenforceable provision as may be possible and be valid and enforceable. 

17. This Letter Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving
effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. The parties hereto (i) all agree that any action, proceeding, claim or dispute arising out of, or relating in any way
to, this Letter Agreement shall be brought and enforced in the courts of New York City, in the State of New York, and irrevocably submit to such jurisdiction and venue, which jurisdiction and venue shall be exclusive and (ii) waive any
objection to such exclusive jurisdiction and venue or that such courts represent an inconvenient forum. 
 18. Any notice, consent or
request to be given in connection with any of the terms or provisions of this Letter Agreement shall be in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery
or facsimile transmission. 
 19. This Letter Agreement shall terminate on the earlier of (i) the expiration of the Lock-up Periods or (ii) the liquidation of the Company; provided, however, that this Letter Agreement shall earlier terminate in the event that the Public Offering is not consummated by December 31, 2020;
provided further that paragraph 4 of this Letter Agreement shall survive such liquidation for a period of six years. 
 [Signature page
follows] 

  
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	Sincerely,
	
	GENESIS PARK HOLDINGS
	
	By: Genesis Park II LP, as Manager
	
	By: Genesis Park II GP LLC, its General Partner
		
	By:	 	 
		 	Name: Paul W. Hobby
		 	Title: Authorized Signatory
		
	By:	 	/s/ Paul W. Hobby
		 	Paul W. Hobby
		
	By:	 	/s/ Jonathan E. Baliff
		 	Jonathan E. Baliff
		
	By:	 	/s/ David Bilger
		 	David Bilger
		
	By:	 	/s/ David N. Siegel
		 	David N. Siegel
		
	By:	 	/s/ Thomas Dan Friedkin
		 	Thomas Dan Friedkin
		
	By:	 	/s/ Andrea Fischer Newman
		 	Andrea Fischer Newman
		
	By:	 	/s/ Richard H. Anderson
		 	Richard H. Anderson
		
	By:	 	/s/ Wayne Gilbert West
		 	Wayne Gilbert West



  
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 Acknowledged and agreed: 

GENESIS PARK ACQUISITION CORP. 
  

			
	By:	 	/s/ Paul W. Hobby
	Name: Paul W. Hobby 
Title: Chief Executive Officer


  
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