**Exhibit 4.4****IMPORTANT NOTICE****THIS INSTRUMENT CONTAINS A CONFESSION OF JUDGMENT PROVISION WHICH CONSTITUTES AWAIVER OF IMPORTANT RIGHTS YOU MAY HAVE AS A DEBTOR AND ALLOWS THE CREDITOR TOOBTAIN A JUDGMENT AGAINST YOU WITHOUT ANY FURTHER NOTICE.****REVOLVING NOTE**   $6,000,000.00 As of March 2nd, 2006     FOR VALUE RECEIVED, Horne Engineering Services, LLC, and Spectrum Sciences & Software HoldingsCorp. (jointly and severally, the “Borrower”), both having an address at c/o Horne EngineeringServices, LLC, 3130 Fairview Park Drive, Suite 400, Falls Church, Virginia 22042, promise to pay tothe order of Bank of America, N.A., a national banking association (the “Lender”), the principalsum of Six Million and 00/100 Dollars ($6,000,000.00) (the “Principal Sum”), or so much thereof ashas been or may be advanced or readvanced to or for the account of the Borrower pursuant to theterms and conditions of the Loan Agreement (as hereinafter defined), together with interest thereonat the rate or rates hereinafter provided, in accordance with the following terms:1. **Interest**.     a. Commencing as of the date hereof and continuing thereafter, the unpaid PrincipalSum shall bear interest at a fluctuating annual rate equal to the LIBOR Rate (as hereafterdefined), plus Two and One Half of a percent (2.50%). The “LIBOR Rate” means the interest ratedetermined by the following formula, rounded upward to the nearest 1/100 of one percent.     LIBOR Rate = London Inter-Bank Offered Rate         (1.00 - Reserve Percentage)  “London Inter-Bank Offered Rate” means the average per annum interest rate at which U.S. dollardeposits would be offered for an “Interest Period” of one (1) month by major banks in the Londoninter-bank market, as shown on the Telerate Page 3750 (or any successor page) at approximately11:00 a.m. London time two (2) London Banking Days before the commencement of the Interest Period.If such rate does not appear on the Telerate Page 3750 (or any successor page), the rate for thatInterest Period will be determined by such alternate method as reasonably selected by Lender. A“London Banking Day” is a day on which Lender’s London Banking Center is open for business anddealing in offshore dollars. “Reserve Percentage” means the total of the maximum reservepercentages for determining the reserves to be maintained by member banks of the Federal ReserveSystem for Eurocurrency Liabilities, as defined in Federal
 

 
Reserve Board Regulation D, rounded upward to the nearest 1/100 of one percent. The percentage will beexpressed as a decimal, and will include, but not be limited to,marginal, emergency,supplemental, special, and other reserve percentages. The first day of the Interest Period mustbe a day other than a Saturday, or a Sunday on which Lender is open for business in New York andLondon and dealing in offshore dollars (a “LIBOR Banking Day”). The last day of the InterestPeriod and the actual number of days during the Interest Period will be determined by Lender usingthe practices of the London inter-bank market. Absent manifest error, the Lender’s certificate tothe Borrower stating the LIBOR Rate for each Interest Period shall be conclusive.     The rate at which interest shall accrue under this Note may change immediately upon any changeat the commencement of each Interest Period (if the London Inter-Bank Offered Rate has changed).     All interest payable under the terms of this Note shall be calculated by applying a dailyinterest rate, determined by multiplying the outstanding principal balance by the applicable annualinterest rate and dividing the resulting product by 360, to the actual number of days principal isoutstanding.2. **Payments and Maturity**. The unpaid Principal Sum, together with interest thereon at therate or rates provided above, shall be payable as follows:     a. interest shall be due and payable monthly, commencing on the first day of the firstcalendar month after the date of this Note, and on the first day of each succeeding calendar month.     b. unless sooner paid, the unpaid Principal Sum, together with all interest accrued and unpaidthereon, and all other amounts owing under this Note shall be due and payable in full on April 30,2007 (the “Maturity Date”). If the Loan Agreement provides for the Borrower to make additionalpayments on account of the Principal Sum from time to time, Borrower promises to make thosepayments at the time and in the manner specified in the Loan Agreement.3. **Default Interest**. Upon the occurrence of an Event of Default (as hereinafter defined),the unpaid Principal Sum shall bear interest thereafter, until the Event of Default is cured, at arate of two percent (2%) per annum in excess of the rate or rates of interest that would otherwisebe in effect under this Note.4. **Late Charges**. If the Borrower fails to make any payment under the terms of this Notewithin ten (10) days after the date such payment is due, the Borrower shall pay to the Lender ondemand a late charge equal to five percent (5%) of such payment.5. **Application and Place of Payments**. Except as otherwise provided in the Loan Agreement(hereinafter defined), all payments, made on account of this Note shall be applied
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first to the payment of accrued and unpaid interest then due hereunder, second to the unpaid principalbalance and the remainder, if any, shall be applied to any otheramounts which remain owinghereunder. All payments on account of this Note shall be paid in lawful money of the United Statesof America in immediately available funds during regular business hours of the Lender at its officeat 1101 Wootton Parkway, 4th Floor, Rockville, Maryland 20852, or at such other timesand places as the Lender may at any time and from time to time designate in writing to theBorrower.6. **Loan Agreement**. This Note is the “Revolving Note” described in a Revolving Line ofCredit Loan Agreement and Security Agreement of even date herewith by and between the Borrower andthe Lender (the “Loan Agreement”). The indebtedness evidenced by this Note is included within themeaning of the term “Debt” as defined in the Loan Agreement. The term “Loan Documents” as used inthis Note shall have the meaning ascribed to that term in the Loan Agreement. Capitalized termsused in this Note but not defined herein have the meanings ascribed to them in the Loan Agreement.7. **Security**. This Note is secured by the Collateral described in the Loan Agreement.8. **Events of Default**. The occurrence of any one or more of the following events shallconstitute an event of default (individually, an “Event of Default” and collectively, the “Eventsof Default”) under this Note:     a. the failure of the Borrower to pay to the Lender when due any amount payable by theBorrower to the Lender under the terms of this Note, or the failure of the Borrower to perform anyother obligation under the terms of the Note; or     b. the occurrence of an event of default under any of the other Loan Documents.9. **Remedies**. Upon the occurrence of an Event of Default, at the option of the Lender, allprincipal, accrued interest and other sums payable by the Borrower to the Lender under the terms ofthis Note shall become immediately due and payable, and the Lender shall have all of the rights,powers, and remedies available under the terms of this Note, any of the other Loan Documents andall applicable laws. The Borrower and all endorsers hereby jointly and severally waivepresentment, protest and demand, notice of protest, notice of demand and of dishonor andnon-payment of this Note and expressly agree that this Note or any payment hereunder may beextended from time to time without in any way affecting the liability of the Borrower or anyendorsers.     **Confession of Judgment**. The Borrower hereby appoints Joseph P. Corish and Jennifer A.Brust, and each of them, as the Borrower’s true and lawful attorney-in-fact, for the Borrower, inthe Borrower’s name, place and stead, to confess judgment against the Borrower, if an Event ofDefault should occur, in the Circuit Court of Fairfax County, Virginia, for the principaloutstanding under this Note, together with interest, late payment charges, court costs and
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attorney’s fees equal to fifteen percent (15%) of the unpaid principal balance for which judgmentis confessed, hereby ratifying and confirming the acts of said attorney-in-fact as fully as if doneby the Borrower. The Borrower consents to immediate execution of any such confessedjudgment and waives the benefit of any exemption laws. No single exercise of the foregoing powerto confess judgment will be deemed to exhaust the power, whether or not such exercise shall be heldby any court to be invalid, voidable or void; but the power will continue undiminished and may beexercised from time to time as Lender may elect until all amounts owing under this Note have beenpaid in full.10. **Expenses**. The Borrower promises to pay to the Lender on demand by the Lender all costsand expenses incurred by the Lender in connection with the collection, enforcement and/or defenseof this Note, including, without limitation, all attorneys’ fees and expenses, all court costs andall arbitration fees and costs.11. **Notices**. Any notice, request, or demand to or upon the Borrower or the Lender shall bedeemed to have been properly given or made when delivered in accordance with the Loan Agreement.12. **Miscellaneous**. Each right, power, and remedy of the Lender as provided for in thisNote or any of the other Loan Documents, now or hereafter existing under any applicable law orotherwise, shall be cumulative and concurrent and shall be in addition to every other right, power,or remedy provided for in this Note or any of the other Loan Documents now or hereafter existingunder any applicable law, and the exercise or beginning of the exercise by the Lender of any one ormore of such rights, powers, or remedies shall not preclude the simultaneous or later exercise bythe Lender of any or all such other rights, powers, or remedies. No failure or delay by the Lenderto insist upon the strict performance of any term, condition, covenant, or agreement of this Noteor any of the other Loan Documents, or to exercise any right, power, or remedy available upon abreach thereof, shall constitute a waiver of any such term, condition, covenant, or agreement or ofany such breach, or preclude the Lender from exercising any such right, power, or remedy at a latertime or times. By accepting payment after the due date of any amount payable under the terms ofthis Note, the Lender shall not be deemed to waive the right either to require prompt payment whendue of all other amounts payable under the terms of this Note or to declare an Event of Default forthe failure to effect such prompt payment of any such other amount. No course of dealing orconduct shall be effective to amend, modify, waive, release, or change any provisions of this Note.13. **Partial Invalidity**. If any term or provision of this Note or the application thereofto any person or circumstance shall be invalid or unenforceable to any extent, the remainder ofthis Note and the application of such term or provision to persons or circumstances other thanthose as to which it is held invalid or unenforceable shall not be affected thereby, and each termand provision of this Note shall be valid and be enforceable to the fullest extent permitted bylaw.14. **Captions**. The captions herein set forth are for convenience only and shall not bedeemed to define, limit, or describe the scope or intent of this Note.
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15. **Governing Law**. The provisions of this Note shall be construed, interpreted andenforced in accordance with the laws of the Commonwealth of Virginia (excluding Virginia’s choiceof law rules).16. **Consent to Jurisdiction**. Provisions of the Loan Agreement concerning the Borrower’sconsent to the jurisdiction of state and federal courts sitting in the Commonwealth of Virginia areincorporated into this Note by reference and shall have the same force and effect as if fully setforth in this Note.17. **Waiver of Trial by Jury**. Provisions of the Loan Agreement concerning the Borrower’sand Lender’s mutual waiver of trial by jury in disputes between the Borrower and the Lender areincorporated into this Note by reference and shall have the same force and effect as if fully setforth in this Note.18. **Arbitration**. Provisions of the Loan Agreement specifying that certain disputes betweenthe Borrower and the Lender shall be resolved by binding arbitration are incorporated into thisNote by reference and shall have the same force and effect as if fully set forth in this Note.19. **Joint and Several Liability; Notices to Borrower**. The liability under this Note of thepersons comprised by the term Borrower shall be joint and several. References in this Note to theBorrower shall refer to each such person or to all of them as the context may require. Any noticethat the Lender provides to Horne Engineering Services, LLC in accordance with the Loan Agreementshall be deemed to have been given to all of the persons comprised by the term Borrower.[signature and notary pages follow]
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     IN WITNESS WHEREOF, the Borrower has caused this instrument to be executed by Borrower’s dulyauthorized officer or officers as of the date first written above.         HORNE ENGINEERING SERVICES, LLC, a Virginia limited liability company           By: Spectrum Sciences & Software Holdings Corp., aDelaware corporation, its sole member           By: /s/ Darryl K. Horne (SEAL)         Name: Darryl K. Horne    Title: President and Chief Executive Officer           HORNE ENGINEERING SERVICES, LLC, a Virginia limited liability company           By: /s/ Darryl K. Horne (SEAL)         Name: Darryl K. Horne    Title: Manager, President and Chief Executive