Cmdr. David Menchaca, former commanding officer of Coast Guard Port Security Unit 312, conducts a personnel inspection of the PSU 312 crew during a change of command ceremony held at Air Station San Francisco, Saturday, Sept. 21, 2013. The change of command ceremony is a time-honored military tradition, which designates the total transfer of responsibility, authority and accountability for a unit and its crew from one individual to another. (Coast Guard photo by Petty Officer 3rd Class Loumania Stewart)