"Especially in the nuclear enterprise, it's a position of great trust and responsibility. The nuclear deterrence mission is one of great focus, discipline. Personal behavior is vital to that, especially from a commander."

Separately, two senior defense officials with knowledge of the allegations told the AP that they are at least partly related to alcohol use. The officials spoke only on condition of anonymity because they were was not authorized to discuss an internal investigation that is not yet finished.

Carey began his Air Force career in the enlisted ranks in 1978. He was commissioned as an officer in 1983 and is a veteran of the wars in Iraq and Afghanistan. He took command of the ICBM force, at 20th Air Force headquarters at F.E. Warren Air Force Base, Wyo., in June 2012.