KILN, Miss. - Coast Guard Port Security Unit 308 members walk across the tarmac to board a U.S. Air Force C-5M Galaxy at Stennis International Airport, Jan. 28, 2012. PSU 308 along with PSU 305, 307 and 311, are deploying to support Operation Bold Alligator 2012, the largest amphibious assault exercise in a decade. U.S. Coast Guard photo by Petty Officer 2nd Class Michael Anderson.