FORT EUSTIS, Va. - Port Security Unit (PSU) 305 members march in formation during a four-day field evolution, May 20, 2011. PSUs provide protection to vessels in security zones and pier areas and also provide security for internal unit needs such as the command center, communications center, berthing areas entry control points (ECP), vehicle control points (VCP) and traffic control/vehicle movement. U.S. Coast Guard photo by Petty Officer 2nd Class Michael Anderson.