Rear Adm. Kevin S. Cook inspects the Honor Guard at his change of command and retirement ceremony, Friday, May 15, 2015. Rear Adm. Kevin Cook was relieved by Rear Adm. David R. 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.