Two landing craft air cushions prepare to enter the well deck. Two landing craft air cushions, also known as LCACs, prepare to enter the well deck of the amphibious dock landing ship USS Tortuga (LSD 46) while at sea on May 20, 2007. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 218332-R-QEL08-415.jpg Photo Gallery