Rear Adm. Kevin S. Cook (right) salutes Rear Adm. David R. Callahan (left) as he officially passes command of the Coast Guard's Eighth District to Callahan, Friday, May 15, 2015. Cook was relieved by Callahan as the district commander, a job that 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)