MIZZEN MAST U.S. Navy Chief Petty Officer David Twiford, command master of the USS Constitution, climbs the shrouds of the mizzen mast in Boston, June 4, 2010. The crew of Constitution hosted about 150 members of the Wounded Warrior Project during a Battle of Midway commemoration. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 509064-H-CGL38-836.jpg Photo Gallery