Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Arlington Heights Air Force Station (1 member)
- Arlington Heights Army Air Defense Command Post C-80DC (1 member)
- Arlington Line - U.S. Civil War (33 members)
- Arlington National Cemetery (15 members)
- Armories (2 members)
- Armory (1 member)
- Arms Companies (20 members)
- Army Air Base, Colorado Springs (1 member)
- Army Air Corps Station No. 8 (1 member)
- Army Air Defense Command Posts (1 member)
- Army Air Fields (2 members)
- Army Arctic Center (1 member)
- Army War College (1 member)
- Arnold Air Force Base (1 member)
- Arnott Barracks (1 member)
- Aroostook War Forts (12 members)
- Arrow Rock Fort (1 member)
- Arrowsic Fort (1) (1 member)
- Arrowsic Fort (2) (1 member)
- Arsenal of Fort Saint Helena Island (1 member)
- Arsenals (148 members)
- Artillery Park (1 member)
- Ashburn FAA Radar Site (1 member)
- Ashley Military Reservation (1 member)
- Ashton FAA Radar Site (1 member)
- Athabasca Fort (1 member)
- Atlanta ARTCC (7 members)
- Atlanta Arsenal (1 member)
- Atlanta FAA Radar Site (1 member)
- Atolia Air Force Station (1 member)
- Auburn Blockhouse (1 member)
- Audley Paul's Fort (1 member)
- Augusta Arsenal (1 member)
- Augusta Arsenal (1) (1 member)
- Augusta Arsenal (2) (1 member)
- Augusta Powder Works (1 member)
- Aurora Flight Strip (1 member)
- Austin Arsenal (1 member)
- Authors (10 members)
- BC-610 (2 members)
- BC-640 (1 member)
- BMDS Radar Sites (5 members)
- BMEWS Radar Sites (1 member)
- BOMARC Launch Sites (1 member)
- BOMARC Sites (3 members)
- BOS Radar Sites (2 members)
- BUIC Sites (28 members)
- Bacon's Castle (1 member)
- Badlam's Battery (1 member)
- Badlam's Redoubt (1 member)