NMCB-21

Naval Mobile Construction Battalion 21 (NMCB-21), known as the "Iron Horses," is a unit of the United States Navy Seabees within the Naval Construction Force Reserve. Established during World War II, NMCB-21 was originally commissioned in 1942 and played a key role in constructing airfields, bases, and infrastructure in both the Atlantic and Pacific theaters. After deactivation post-war, the battalion was reestablished as part of the Navy Reserve, continuing its legacy by supporting both military and humanitarian missions worldwide. NMCB-21 has participated in various operations, including disaster relief and contingency construction, demonstrating the Seabees' motto, "We Build, We Fight."