Secure Communication Systems and private equity firm Vance Street Capital have acquired training, instrumentation and surveillance company Tactical Micro, Inc. from private equity firm Relativity Capital. M&A focused investment bank KippsDeSanto & Co. advised Tactical Micro on the deal and said it was reminiscent of key trends they have seen in the defense M&A environment. …

Information technology services provider Trowbridge & Trowbridge has acquired Fredericksburg,Va-.based IntelliWare Systems for an undisclosed amount in a move to expand the former’s national security portfolio and client network.

Information technology companies Smartronix and Trident Technologies have received strategic investments from New York-based private equity firm OceanSound Partners.

Dovel Technologies has acquired Reston, Va.-based government information technology services contractor Ace Info Solutions for an undisclosed sum in an effort to broaden market capabilities and diversify its client base.

E3/Sentinel has bought Reston, Va.-based enterprise information management company Data Works as part of efforts to grow analytics, engineering and software development service offerings for the intelligence community market.

A consortium of investors led by venture capital firm ClearSky has acquired engineering and analytics platforms provider Altamira Technologies for an undisclosed sum.

Peraton has agreed to acquire Arlington, Va.-based information technology and satellite ground systems provider Solers for an undisclosed sum to further build up its capability to deliver space protection and resiliency platforms in support of national security programs.

Health care services contractor DLH Holdings (Nasdaq: DLHC) has purchased Silver Spring, Md.-based public health research organization Social & Scientific Systems for $70M in cash.

Alion Science and Technology has agreed to buy MacAulay-Brown for an undisclosed sum to expand work with national security customers and engineering and technology offerings. Steve Schorer, Alion president and CEO and a 2018 Wash100 winner, said in a statement released Thursday the company made the acquisition in a push to …

SAP National Security Services has acquired signals intelligence and engineering services contractor Technology Management Associates for an undisclosed sum in a move to broaden its footprint in the intelligence community and advance the delivery of platforms to the federal government. SAP NS2 said Tuesday it completed the acquisition on April …