**Exhibit 21.1**

**Subsidiaries of the Registrant**

Systems Research and Applications Corporation, a corporationorganized under the laws of the Commonwealth of Virginia 

SRA Ventures, LLC, a limited liability company organized under the laws of theState of Delaware 

The Orion Center for Counterterrorism, Counterintelligence, and Law Enforcement, a wholly owned subsidiary of SystemsResearch and Applications Corporation and a corporation organized under the laws of the State of California 

Touchstone Consulting Group,Inc., a wholly owned subsidiary of Systems Research and Applications Corporation and a corporation organized under the laws of the Commonwealth of Virginia 

Galaxy Scientific Corp., a wholly owned subsidiary of Systems Research and Applications Corporation and a corporation organized under the laws of the State of New Jersey 

Spectrum Solutions Group, Inc., a wholly owned subsidiary of Systems Research and Applications Corporation and a corporation organized under the laws ofthe State of Maryland 

RABA Technologies, LLC, a wholly owned subsidiary of Systems Research and Applications Corporation and a limitedliability company organized under the laws of the State of Maryland 

Orion Security Solutions, LLC, a wholly owned subsidiary of The OrionCenter for Counterterrorism, Counterintelligence, and Law Enforcement and a limited liability company organized under the laws of the State of Delaware 

SRA Defense Solutions, LLC, a wholly owned subsidiary of Systems Research and Applications Corporation and a limited liability company organized under the laws of the State of Delaware 

Constella Group, LLC, a wholly owned subsidiary of Systems Research and Applications Corporation and a limited liability company organized under the lawsof the State of North Carolina 

Constella Futures Holding, LLC, a wholly owned subsidiary of Constella Group, LLC and a limited liabilitycompany organized under the laws of the State of Delaware 

Constella Futures International, LLC, a wholly owned subsidiary of ConstellaFutures Holding, LLC and a limited liability company organized under the laws of the State of Delaware 

Constella Futures, Ltd., a whollyowned subsidiary of Constella Futures Holding, LLC and a limited company organized under the laws of the United Kingdom 

Constella FuturesIndia, Pvt., Ltd., a wholly owned subsidiary of Constella Futures Holding, LLC and a limited company organized under the laws of India 

Constella Futures Nigeria, Ltd., a wholly owned subsidiary of Constella Futures Holding, LLC and a company organized under the laws of Nigeria 

Constella Futures South Africa (Proprietary) Limited, a wholly owned subsidiary of Constella Futures, Ltd. and a limited company organized under the laws of South Africa 

Constella Group Product Development, LLC, a wholly owned subsidiary of Constella Group, LLC and a limited liability company organized under the laws ofthe State of North Carolina 

Constella Group Holding, Ltd., a wholly owned subsidiary of Constella Group Product Development, LLC anda limited company organized under the laws of the United Kingdom 

Constella Group, Ltd., a wholly owned subsidiary of Constella GroupHolding, Ltd. and a limited company organized under the laws of the United Kingdom 

Constella Group, SARL, a wholly owned subsidiary ofConstella Group Holding, Ltd. and a company organized under the laws of France 

Constella Group, GmbH, a wholly owned subsidiary ofConstella Group Holding, Ltd. and a company organized under the laws of Germany 

Constella Group, PTY, Ltd., a wholly owned subsidiary ofConstella Group Holding, Ltd. and a company organized under the laws of Australia 

Constella Group, d.o.o, a wholly owned subsidiary ofConstella Group Holding, Ltd. and a company organized under the laws of Croatia 

Interface and Control Systems, Inc., a wholly ownedsubsidiary of Systems Research and Applications Corporation and a corporation organized under the laws of Florida 

Era Systems Corporation,a wholly owned subsidiary of Systems Research and Applications Corporation and a corporation organized under the laws of Delaware 

RannochCZ s.r.o., wholly owned by Era Systems Corporation and a limited liability entity organized under the laws of the Czech Republic 

M/S ERAa.s., wholly owned by Rannoch CZ s.r.o and a limited liability entity organized under the laws of the Czech Republic