Background Information

USN Naval Gun Designations
USN Ship Designations

Modern Weapons

1980 to Present
150 mm Electromagnetic Rail Gun
Future Warships
 155 mm/62 AGS
Zumwalt (DDG-1000) Class
 5"/62 Mark 45 Mod 4
Arleigh Burke (DDG-51) and Ticonderoga Flight II (CG-52) Classes
 5"/54 Mark 45 Mods 0 - 2
Cruisers and Destroyers 1970s to 2000
 5"/54 Mark 42
US Ships 1950s to 1980s
 76 mm/62 Mark 75
Navy frigates, hydrofoils and the larger Coast Guard cutters
 57 mm/70 Mark 110
Freedom (LCS-1) and Constellation (FFG-62) Classes
USCG Bertholf Class (Maritime Security Cutter, Large)
 40 mm Mark 19 Grenade MG
Destroyers and Cyclone (PC-1) Class
 30 mm Bushmaster II Mark 44
San Antonio (LPD-17), Freedom (LCS-1) and Zumwalt (DDG-1000) Classes
 25 mm Mark 38 MGS
Amphibious and auxiliary ships, patrol craft and Coast Guard cutters
 20 mm Phalanx
US ships after 1978
 20 mm Mark 16
Patrol Craft and Coast Guard Cutters
 0.50"/72 M3M GAU-21
US Rotary-wing Aircraft
 0.50"/70 Gatling GAU-19/A
US Aircraft and Warships
 0.50" BMG M2 GAU-16
US ships 1930s to present
 0.30" GAU-17
Light Aircraft, Helicopters and Ships 1970s to present
 7.62 mm Bushmaster Chaingun Mark 52
Surface ships

Historical Weapons

Battleship Main Guns

18"/48 Mark 1
16"/56 Mark 4
18"/47 Mark A
Experimental Gun
 16"/50 Mark 7
Iowa (BB-61) and Montana (BB-67) Classes
 16"/45 Mark 6
North Carolina (BB-55) and South Dakota (BB-57) Classes
 16"/45 Marks 5 and 8
Colorado Class (BB-45)
 16"/50 Marks 2 and 3
South Dakota (BB-49) and Lexington (CC-1) Classes
 16"/45 Mark 1
Colorado Class (BB-45)
 14"/50 Marks 7 and 11
14"/50 Mark B
New Mexico (BB-40) and Tennessee (BB-43) Classes
Planned for North Carolina (BB-55) Class
 14"/45 Marks 8, 9, 10 and 12
New York (BB-34), Nevada (BB-36) and Pennsylvania (BB-38) Classes
 14"/50 Marks 4 and 6
New Mexico (BB-40) and Tennessee (BB-43) Classes
 14"/45 Marks 1, 2, 3 and 5
New York (B-34), Nevada (B-36) and Pennsylvania (B-38) Classes
 13"/35 Marks 1 and 2
Indiana (B-1), Kearsarge (B-5) and Illinois (B-7) Classes
 12"/50 Mark 8
Alaska (CB-1) Class
 12"/50 Mark 7
Wyoming (B-32) Class
 12"/45 Marks 5 and 6
Connecticut (B-18), Mississippi (B-23), South Carolina (B-26), Delaware (B-28) and Florida (B-30) Classes
 12"/40 Marks 3 and 4
Arkansas (M-7), Maine (B-10) and Virginia (B-13) Classes
 12"/35 Marks 1 and 2
Texas (1895), Iowa (B-4), Puritan (M-1) and Monterey (M-6) Classes
 10"/40 Mark 3
Tennessee (ACR-10) Class
 10"/31 Mark 1 Mod 0 and Mod 1,
10"/34 Mark 1 Mod 2,
10"/30 Mark 2
Amphitrite (M-2), Mianonomoh (M-5), Monterey (M-6) and Maine (1895) Classes
 9"/98 Mark 1
Experimental

Cruiser / Destroyer Main Guns and Battleship / Cruiser Secondary Guns

8"/55 Mark 71
Hull (DD-945)
 8"/55RF Mark 16
Des Moines (CA-134) Class
 8"/55 Marks 12 and Mark 15
Tuscaloosa (CA-37), Wichita (CA-45), Baltimore (CA-68) and Oregon City (CA-122) Classes
 8"/55 Marks 9, 10, 11, 13 and 14
Lexington (CV-2), Pensacola (CA-24), Northampton (CA-26), Portland (CA-33) and early New Orleans (CA-32) Classes
 8"/23 Mark 7
8"/15 Mark 8
"Flush-deck" destroyers
 8"/45 Mark 6
Virginia (B-13), Connecticut (B-18) and Mississippi (B-23) Classes
 8"/35 Marks 3 and 4,
8"/40 Mark 5
Indiana (B-1), Iowa (B-4), Kearsarge (B-5), New York (ACR-2), Brooklyn (ACR-3), Pennsylvania (ACR-4), Charleston (C-2), Baltimore (C-3), Olympia (C-6) and Columbia (C-12) Classes
 8"/30 Marks 1 and 2
Atlanta and Chicago Classes ("New Navy" ships)
 7"/44 Mark 1
7"/45 Mark 2
Connecticut (B-18) and Mississippi (B-23) Classes
 6"/47 Mark 17
Erie (PG-50) Class
 6"/47DP Mark 16
Worcester (CL-144) Class
 6"/47 Mark 16
Brooklyn (CL-40), St. Louis (CL-49), Cleveland (CL-55) and Fargo (CL-106) Classes
 6"/53 Marks 12, 14, 15 and 18
Omaha (CL-4), South Dakota (BB-49), Lexington (CC-1), Argonaut (SS-166) and Narwhal (SS-167) Classes
 6"/44 Mark 9,
6"/45 Mark 10,
6"/50 Mark 11,
6" Mark 13
Miscellaneous 6" guns
 6"/50 Marks 6 and 8
Maine (B-10), Virginia (B-13), St. Louis (C-20) and Pennsylvania (ACR-4) Classes
 6"/50 Mark 5
New Orleans Class ("Elswick Cruisers")
 6"/30 Marks 1, 2 and 3
6"/35 Mark 3
6"/40 Marks 3, 4 and 7
Dolphin, Chicago, Atlanta (1886), Boston, Maine (1895), Texas (1895), Indiana (B-1), Iowa (B-4), Illinois (B-7), Newark (C-1), Charleston (C-2), Baltimore (C-3), Philadelphia (C-4), San Francisco (C-5), Cincinnati (C-7) and Yorktown (PG-3) Classes
 5.4"/48 Mark 1
5"/70 Type F
5"/54 Mark 65
5"/54 Mark 66
Proposed 5.4" and 5" guns of the 1940s - 1960s
 5"/54 Mark 16
Montana (BB-67) and Midway (CVB-41) Classes
 5"/38 Mark 12
US ships 1930s to 1980s
 5"/25 Marks 10, 11, 13 and 17
US ships 1920s to 1940s
 5"/51 Marks 7, 8, 9, 14 and 15
Battleships 1910s to 1940s, a few destroyers, submarines and auxiliaries
 5"/50 Marks 5 and 6
Delaware (B-28), Denver (C-14) and Chester (CS-1) Classes
New Orleans Class ("Elswick Cruisers") as rearmed
 5"/40 Marks 2, 3 and 4
Kearsarge (B-5), Brooklyn (ACR-3), Olympia (C-6), Cincinnati (C-7) and Montgomery (C-9) Classes
 5"/31 Mark 1
Chicago (1885) and Auxiliary Cruisers
 4.7"/50 Mark 3
New Orleans Class ("Elswick Cruisers")
 4"/50 Marks 7, 8, 9 and 10
"Flush Deck" destroyers and Submarines 1935-1941
 4"/40 Marks 1, 3, 4, 5 and 6
4"/39 Mark 2
Iowa (B-4), Columbia (C-12), New York (ACR-2), Nashville (PG-7) and Wilmington (PG-8) Classes

Smaller Caliber and Anti-Aircraft Guns

3"/70RF Mark 37
Carpenter (DDE-825), Northampton (CLC-1), Norfolk (DL-1) and Mitscher (DL-2) Classes
 3"/50RF Marks 27, 33 and 34
US Ships 1945 to 1980
 3"/50 Marks 10, 17, 18, 19, 20, 21 and 22
Arkansas (B-33), New York (B-34), Omaha (CL-4), Buckley (DE-51), Cannon (DE-99), Edsall (DE-129) and Gato (SS-212) Classes
 3"/15 Mark 12
3"/24 Mark 15
3"/105 Mark 16
Experimental and Miscellaneous 3" Guns
 3"/23 Marks 4, 7, 9, 11, 13 and 14
US Ships 1900s to 1940s
 3"/50 Marks 2, 3, 5, 6 and 8
US Ships 1900s to 1920s
 3"/21 Mark 1
Boat Guns
 6-pdr (57 mm)
US Ships 1880s to 1910s
 3-pdr (47 mm)
US Ships 1880s to 1910s
 40 mm/56.3 Bofors Mark 1, Mark 2 and M1
US Ships 1940s to 1960s
Spectre Patrol Boats 1980s
 37 mm/56 M4
PT Boats
 1-pdr (37 mm)
US Ships 1880s to 1920s
 35 mm/1000 KDG Millennium GDM-008
Sea Slice
 30 mm Emerlec-30
Coastal Patrol Boats
 1.1"/75 Marks 1 and 2
US Ships 1930s to 1940s
 20 mm/70 Oerlikon Marks 2, 3 and 4
Most US Ships 1940s
 0.30" MG
US Ships 1930s to 1940s
 Zalinsky Pneumatic "Dynamite" Guns
USS Vesuvius and USS Holland