The Blue Grass Chemical Agent-Destruction Pilot Plant (BGCAPP) will destroy one of the most complex chemical weapons remaining in the United States: M55 rockets. At 6.5 feet tall, the M55 rocket is the longest of three types of munitions in the Blue Grass Army Depot stockpile. Originally developed to be fired from M91 launchers on the battlefield, M55 rockets were never used and have been safely stored for decades.