CHOCK AND CHAINS U.S. Navy sailors remove the chock and chains securing an SH-60F Sea Hawk helicopter assigned to Helicopter Anti-submarine Squadron 15, which is deployed aboard the USS Bunker Hill in the Pacific Ocean, March 21, 2010. The Bunker Hill is supporting Southern Seas, a U.S. Southern Command-directed operation to provide U.S. and international forces the opportunity to operate in a multinational environment. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 847470-S-KTF02-124.jpg Photo Gallery