The 100-foot tug boat was a single engine ocean tug boat in service since the 1950s. In the 1990s the vessels were refitted with a modern diesel engine and, due to stability concerns, were reclassified as "harbor tugs". The 100-foot tug boats have been systematically removed from the Army and Army Reserve inventory and replaced with a fleet of six modern, twin engine 128-foot ocean going tug boats. The last major mission for the Anzio was supporting the Joint Logistics Over The Shore (JLOTS) exercise at Camp Pendleton, Calif., in 2008. The vessel now belongs to the Native Village of Eyak, Alaska.