USS Fort Mandan LSD 21

USS Fort Mandan (LSD-21) was a Casa Grande-class dock landing ship of the United States Navy, commissioned on October 31, 1945. Originally intended for service in World War II, she was completed too late to see combat in that conflict. Throughout her career, Fort Mandan participated in numerous amphibious exercises, NATO operations, and Cold War deployments, including service in the Atlantic and Mediterranean. The ship was decommissioned in 1971 and later transferred to the Hellenic Navy, where she served as Nafkratousa (L153) until her retirement.