Lexington Park-based Eagan, McAllister Associates, Inc., a subsidiary of McLean-based Science Applications International Corp., has won a contract with the Space and Naval Warfare Systems Center in Charleston, S.C., valued at up to $459 million.

The contract calls for command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR) systems services for the Center’s Tactical C2 Engineering Division. Work will be completed in Charleston, Lexington Park and Norfolk, Va.