ALAMEDA, Calif.-- Coast Guard Capt. Thomas Crabbs relieves Capt. Kevin Cavanaugh as commanding officer of the Coast Guard Cutter Boutwell during a change of command ceremony held on Coast Guard Island June 18, 2010. A change of command ceremony is a time-honored naval tradition, which formally restates to the officers and crew of a unit, the continuity and authority of command and is unique in the world today. U.S. Coast Guard photo by Seaman Adam Stanton.