Second Supplemental
Indenture


 


SECOND SUPPLEMENTAL INDENTURE, dated as
of February 3, 2012 (this “Second Supplemental Indenture”), among SRA International, Inc., a Virginia corporation
(the “Successor Company”) formerly known as Systems Research and Applications Corporation, a Virginia corporation,
as successor to SRA International, Inc., a Delaware corporation (the “Predecessor Company”), the Guarantors
signatory to this Second Supplemental Indenture (the “Guarantors”), and Wilmington Trust, National Association,
as Trustee under the Indenture referred to below.


 


WITNESSETH:


 


WHEREAS, the Predecessor Company and the
Trustee are parties to an Indenture, dated as of July 20, 2011 (as amended,
further supplemented, waived or otherwise modified from time to time, including the First Supplemental Indenture Agreement,
the “Indenture”), providing for, among other things,
the issuance of an unlimited aggregate principal amount of 11.00% Senior Notes due 2019 (the “Notes”);


 


WHEREAS, the Predecessor Company has merged
with and into the Successor Company (the “Merger”), with the Successor Company continuing its existence and
being renamed with the Predecessor Company’s name;


 


WHEREAS, Article V of the Indenture provides
that the Predecessor Company shall be permitted to merge with or into any Person, provided that upon any such merger such
resulting, surviving, or transferee Person shall expressly assume all the obligations of the Predecessor Company under the Notes
and the Indenture by executing and delivering to the Trustee a supplemental indenture or one or more other documents or instruments
and that thereupon the Predecessor Company shall automatically be released and discharged from its obligations under the Indenture
and the Notes;


 


WHEREAS, Section 9.01 of the Indenture provides
that, without the consent of the Holders of any Notes, the parties hereto may amend or supplement the Indenture, to provide for
the assumption by a Successor Company of the obligations of the Predecessor Company under the Indenture or to add a Guarantor under
the Indenture;


 


WHEREAS, each Guarantor desires to enter
into such Second Supplemental Indenture for good and valuable consideration, including substantial economic benefit in that the
financial performance and condition of such Guarantor is dependent on the financial performance and condition of the Successor
Company, the obligations hereunder of which such Guarantor has guaranteed, and on such Guarantor’s access to working capital
through the Successor Company’s access to borrowings under the Senior Credit Facilities; and


 



    	 



    	 



    

 


WHEREAS, the Successor Company desires to
enter into this Second Supplemental Indenture for good and valuable consideration;


 


NOW, THEREFORE, in consideration of the
foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Successor Company, the
Guarantors and the Trustee mutually covenant and agree, for the benefit of the Holders of the Notes, as follows:


 


1.         Defined
Terms. As used in this Second Supplemental Indenture, terms defined in the Indenture or in the preamble or recital hereto are
used herein as therein defined. The words “herein,” “hereof” and “hereby” and other words of
similar import used in this Second Supplemental Indenture refer to this Second Supplemental Indenture as a whole and not to any
particular section hereof.


 


2.         Assumption
of Obligations. In accordance with Article V and Section 9.01 of the Indenture, the Successor Company hereby
expressly assumes and agrees to pay, perform and discharge when due each and every debt, obligation, covenant and agreement incurred,
made or to be paid, performed or discharged by the Predecessor Company under the Indenture, the Notes and the Registration Rights
Agreement. The Successor Company hereby agrees to be bound by all the terms, provisions and conditions of the Indenture and the
Notes and agrees that it shall be the Issuer and shall succeed to, and be substituted for, and may exercise every right and power
of, the Predecessor Company under the Indenture and the Notes.


 


3.         Reaffirmation
of Agreement to Guarantee. Each Guarantor hereby consents to the execution and delivery of this Second Supplemental Indenture
and confirms, reaffirms and restates its obligations under each of the Indenture, Notes and the Registration Rights Agreement to
which it is a party.


 


4.         Governing
Law. THIS SECOND SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW
YORK. THE TRUSTEE, THE SUCCESSOR COMPANY, ANY OTHER OBLIGOR IN RESPECT OF THE NOTES AND (BY THEIR ACCEPTANCE OF THE NOTES) THE
HOLDERS AGREE TO SUBMIT TO THE JURISDICTION OF ANY UNITED STATES FEDERAL OR STATE COURT LOCATED IN THE BOROUGH OF MANHATTAN, IN
THE CITY OF NEW YORK IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS SECOND SUPPLEMENTAL INDENTURE.


 


5.         Counterparts.
The parties hereto may sign any number of copies of this Second Supplemental Indenture. Each signed copy shall be an original,
but all of them together represent the same agreement. Delivery of an executed signature page to this Second Supplemental Indenture
by facsimile or other electronic transmission shall be effective as delivery of a manually signed counterpart of this Second Supplemental
Indenture.


 



    	 



    	 



    

 


6.         Effect
of Headings. The Section headings herein have been inserted for convenience of reference only, are not considered a part of
this Second Supplemental Indenture and shall in no way modify or restrict any of the terms or provisions hereof.


 


7.         The
Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of
this Second Supplemental Indenture or for or in respect of the recitals contained herein, all
of which recitals are made solely by each Guarantor or the Successor Company, as the case may be.


 


8.         Successors.
All agreements of the Guarantors in this Second Supplemental Indenture shall bind their respective
successors, except as otherwise provided in Sections 5.01(c)(i), 5.01(d), 5.02 and 10.06 of the Indenture or elsewhere in this
Second Supplemental Indenture. All agreements of the Trustee in this Second
Supplemental Indenture shall bind its successors.


 


9.         Parties.
Nothing in this Second Supplemental Indenture is intended or shall be construed to give any Person, other than the Holders and
the Trustee, any legal or equitable right, remedy or claim under or in respect of each Guarantor’s Guarantee or any provision
contained herein or in Article X of the Indenture.


 


10.         Ratification
of Indenture; Second Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all
respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This
Second Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter
authenticated and delivered shall be bound hereby.


 


[Signature Pages Follow]


 



    	 



    	 



    






 


IN WITNESS WHEREOF, the par ties hereto
have caused this Second Supplemental Indenture to be duly executed, all as of the date first above written.


  


	 	SRA INTERNATIONAL, INC., as 
 Successor Company
	 	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and 

           Treasurer


 


[Signature Page to Second Supplemental Indenture]


 



    	 



    	 



    

 


	 	WILMINGTON TRUST, NATIONAL 

ASSOCIATION as Trustee
	 	 	 
	 	By:	/s/ Joseph P. O’Donnell
	 	 	Name: Joseph P O’Donnell
	 	 	Title:   Vice President


 


[Signature Page to Second Supplemental Indenture]


 



    	 



    	 



    

 


	 	TOUCHSTONE CONSULTING GROUP, INC.
	 	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer
	 	 	 
	 	RABA TECHNOLOGIES, LLC
	 	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer
	 	 	 
	 	CONSTELLA GROUP, LLC
	 	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer
	 	 	 
	 	INTERFACE AND CONTROL SYSTEMS, 

INC.
	 	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer
	 	 	 
	 	PERRIN QUARLES ASSOCIATES, INC.
	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer
	 	 	 
	 	CMA GOVERNMENT SOLUTIONS, INC.
	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer



 





[Signature Page to Second Supplemental Indenture]










 












    	 



    	 



    
  


	 	PLATINUM SOLUTIONS, INC.
	 	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer
	 	 	 
	 	SENTECH HOLDINGS, INC.
	 	 	 
	 	By:	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer
	 	 	 
	 	SENTECH, INC.
	 	 	 
		 By: 	/s/ Richard J. Nadeau
	 	 	Name: Richard J. Nadeau
	 	 	Title:   Chief Financial Officer and Treasurer


 





[Signature Page to Second Supplemental Indenture]