AMPHIBIOUS FORCE U.S. Navy Petty Officer 1st Class Fredrick E. Bliss directs a CH-53 Sea Knight during deck landing qualifications on board the USS Tortuga, Feb. 1, 2007. Tortuga is assigned to the Navy's only forward deployed amphibious force. SHARE: Download: Full Size (0.02 MB) Credit: VIRIN: 319470-C-AJM30-804.jpg Photo Gallery