A DOD spokesman said there was no timetable for replacing outgoing CIO Teri Takai.
Joseph Klimavicz will take over the post that Luke McCormack left in November 2013.
The Pentagon's director of planning and performance management is returning to the private sector.
Mark Forman joins the defense contractor as vice president for IT services and cloud initiatives.
The former DHS undersecretary for management is now a senior adviser at A.T. Kearney.
Federal 100 winner had previously commanded the Cyber National Mission Force.
The general manager's departure comes as the First Responder Network Authority is in the process of developing a business plan and expanding its staff.
Former deputy CTO joins Suss Consulting.
The former presidential innovation fellow's work at the progressive think tank will focus on federal IT, procurement reform and open data.
The longtime government IT leader had announced his plan to leave the Defense Department in late March.
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