The Ford MGM-51 Shillelagh was an American anti-tank guided missile designed to be launched from a conventional gun similar to the 9M119 Svir and 9M119M Refleks. With the up armoring of Tanks during the Cold War, US Army thought that to penterate future tanks armor the tanks of the next generations needs to have a gun that larger than partical or some form of missile system.
The MGM-51 Shillelagh was first fired in 1960, and limited production started in 1964. The missile is first launched out the tube by a small charge in the back and then clear of the gun the Missile engine ignited.
Nearly a half dozen missiles fired at bunkers by Sheridans during Operation Desert Storm (Iraq/Kuwait) in January and February 1991. This was the only time the missile system was fired in combat.