Members of the Coast Guard's Eighth District watch the change of command between Rear Adm. Kevin S. Cook and David R. Callahan, Friday, May 15, 2015. Callahan's job as the district commander carries with it the responsibility of Coast Guard operations spanning 26 states, from the Gulf of Mexico Coastline to the Canadian border and all inland waterways within. The change of command ceremony is a time-honored tradition which formally restates to the officers, enlisted, civilian and auxiliary members of the unit, the continuity and authority of command. (U.S. Coast Guard photograph by Petty Officer 2nd Class Seth Johnson)