In 1961 the United States Strike Command (STRICOM) was established at MacDill Air Force Base as a unified combatant command capable of responding to global crises. The name of the command was originally derived from the acronym for Swift Tactical Reaction In Every Known Environment (STRIKE). It integrated the CONUS-based forces of the Army's Continental Army Command (essentially elements from the Army's Strategic Army Corps (STRAC)) and the Air force's Composite Air Strike Force (CASF) and Tactical Air Command .