Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- U.S. Proving Grounds (4 members)
- U.S. Quartermaster Depot, Yerba Buena Island (1 member)
- UPA-35 (23 members)
- UPA-62 (6 members)
- UPX-14 (26 members)
- UPX-21 (2 members)
- UPX-6 (19 members)
- UPX-7 (1 member)
- UPX 14 (4 members)
- URG-60 (7 members)
- USAFA Superintendents (0 members)
- USAF Data Equipment (2 members)
- USAF Gap Filler Radar Sites (0 members)
- USAF Radar Equipment (19 members)
- USAF Radar Sites (407 members)
- USAF Radar Stations (1 member)
- USMA Superintendents (12 members)
- USN Radar Sites (1 member)
- USSF Radar Sites (1 member)
- US Army Radar Sites (4 members)
- UYK-1 (1 member)
- Uintah Fort (1 member)
- Ulakata Head WWII Radar Site (1) (1 member)
- Ulakata Head WWII Radar Site (2) (1 member)
- Umatilla Chemical Depot (1 member)
- Umatilla Ordnance Depot (1 member)
- Unalakleet Air Force Station (1 member)
- Undeveloped (6 members)
- Union Fort (1 member)
- Union Fur Company Forts (3 members)
- Union POW Camps (0 members)
- United States (42 members)
- United States Air Force Academy (3 members)
- United States Air Force Academy Cemetery (0 members)
- United States Armory and Arsenal at Harpers Ferry (1 member)
- United States Military Academy (43 members)
- United States Naval Academy (0 members)
- United States Naval Air Station North Sydney (1 member)
- United States Powder Depot (1 member)
- University Campus (1 member)
- Unknown (1 member)
- Unknown Condition (2 members)
- Unknown Ownership (6 members)
- Unknown State Forts (0 members)
- Upper Fort (1) (1 member)
- Upper Fort Garry (1 member)
- Upper Portage Camp (1 member)
- Upper Yamaska Blockhouse (1 member)
- Utah Air Force Bases (4 members)
- Utah All (85 members)