Redeye II Missile System Variable Weight Launcher.
U.S. Army Gerald Chaikin, John Chipser, and Nancy Rich, U.S. Army Missile Command, Redstone Arsenal, Ala.
<a rel="nofollow" class="external text" href="http://www.dtic.mil/dtic/tr/fulltext/u2/744457.pdf">Field Investigation of Gunner Aiming Error as a Function of Launcher Weight</a> (best copy available)