Professional staffing company System One has acquired government services contractor GAP Solutions in a push to grow offerings across the federal defense and civilian arenas. Terms of the transaction were undisclosed and GAP Solutions will add 400 employees to System One.

Herndon, Va.-based GAP Solutions was founded in 1999 and focuses on the areas of human capital management, security process management, scientific and technical knowledge, and operations management. Investment bank Bluestone Capital Partners handled the GAP Solutions transaction.