Hansford Tillman (HT) Johnson (born January 3, 1936) is a retired four-star general in the United States Air Force who served as the Acting United States Secretary of the Navy, overseeing the United States Navy and United States Marine Corps in the administration of President George W. Bush. He is the only retired Air Force officer to ever hold that position. Prior to that he was Assistant Secretary of the Navy (Installation and Environment). He currently works at the Institute for Defense Analyses.