Royal Australian and U.S. Navy ships sail in formation off the coast of Townsville, Australia while taking part in activities commemorating the 50th anniversary of the Battle of the Coral Sea. The warships are, (left to right) the guided missile destroyer HMAS PERTH (DDG-38), the USS FLETCHER (DD-992), the U.S. Seventh Fleet flagship USS BLUE RIDGE (LCC-19) and the guided missile frigate HMAS ADELAIDE (FFG-01)