A broad review of the military’s support for the agency is underway, including pulling back personnel and rethinking support for C.I.A. operations around the world.
The Defense Department said Christopher Maier resigned, but his supporters say he was forced out of a job leading military efforts to combat ISIS.
So far, there is no evidence the appointees harbor a secret agenda or arrived with an action plan. But their sudden appearance amounts to a purge of the Pentagon’s top civilian hierarchy without recent precedent.
The arrival of the new officials has prompted concerns. Their backgrounds offer insights into their policies.