The value of the cash transaction, which is expected to be accretive to General Dynamics' earnings beginning in 2012, hasn't been disclosed.
Fortress Technologies, which has headquarters in Massachusetts, produces a portfolio of mesh networking products that enable secure wireless network capabilities for battlefield logistics, convoy, command post and soldier applications.
Fortress Technologies will be managed by General Dynamics C4 Systems, which has headquarters in Scottsdale, Ariz.
General Dynamics C4 Systems designs, manufactures and delivers secure communications systems, command-and-control systems and operational hardware to customers within the U.S. Department of Defense, the intelligence community and federal civilian agencies, and to international customers.
"The acquisition of Fortress accelerates our ability to deliver a wider array of secure, WiFi-based tactical wireless communication systems for military and government users worldwide," said Chris Marzilli, president of General Dynamics C4 Systems.
"These competitively priced products, based on commercial offerings, deliver unprecedented efficiencies in size, weight and power for users from the core to the very edge of the network."