In the armed forces, the various grades of colonels, generals, and admirals are addressed simply as "Colonel," "General," or "Admiral"; their surnames can be added, but during a prolonged conversation the title alone is the simpler option.
Members of the regular armed services retain their titles in retirement, per their individual service regulations. However, reserve officers who served for only a short time—or those who held temporary commissions during a war—shouldn't continue calling themselves "Captain," "Major," or "Colonel" when not in active service. They do, however, use the titles if they resume an active status in a reserve unit or the National Guard. In this case, the initials of their service always follow the name: "Colonel Victor Bacovich, U.S.A.R." (or "N.G.," "U.S.N.R.," or "U.S.M.C.R."). Reserve officers who remain in the service and retire with pay after twenty or more years are, like members of the regular service, entitled to use their military titles.
In the Armed Services, the Department of Defense is represented in the Cabinet by the Secretary of Defense, who ranks third among Cabinet members. The heads of the military departments of the Department of Defense—the Secretary of the Army, the Secretary of the Navy, and the Secretary of the Air Force—do not have a Cabinet rank.
The rank of deputies and assistants is as follows:
The Chairman of the Joint Chiefs of Staff takes precedence over all other officers of the Armed Services. The Chiefs of Staff of the Army and Air Force, the Chief of Naval Operations, and the Commandant of the Marine Corps rank themselves according to the date of their respective appointments and are followed by the Commandant of the U.S. Coast Guard.