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2. American 21-inch torpedo - Wikipedia

   en.wikipedia.org/wiki/American_21-inch_torpedo

   There have been a number of 21-inch torpedoes in service with the United States. These have been used on ships and submarines of the U.S. Navy . American 21-inch torpedoes are 533 millimeters (21 in) in diameter.

3. List of equipment of the Portuguese Army - Wikipedia

   en.wikipedia.org/wiki/List_of_equipment_of_the...

   21: 21 in service. Operated by the 4th Artillery Regiment of the Portuguese Army Rapid Reaction Brigade. [38] [39] M101A1/A1L United States: 45: The Portuguese Army received a total of 54 M101A1 towed howitzers. Despite not being in active service, the Army keeps them stored in reserve situation. [38] [40] 9 units sent to Ukraine in 2024 as ...

4. 14-inch/45-caliber gun - Wikipedia

   en.wikipedia.org/wiki/14-inch/45-caliber_gun

   The 14-inch/45-caliber gun, (spoken "fourteen-inch-forty-five-caliber" [citation needed]), whose variations were known initially as the Mark 1, 2, 3, and 5, and, when upgraded in the 1930s, were redesignated as the Mark 8, 9, 10, and 12. They were the first 14-inch (356 mm) guns to be employed by the United States Navy.

5. 4.5-inch Mark 8 naval gun - Wikipedia

   en.wikipedia.org/wiki/4.5-inch_Mark_8_naval_gun

   A new type of 4.5 inch gun with a longer 55-calibre barrel, it was designed in the 1960s for the Royal Navy's new classes of frigates and destroyers.The weapon, built by Vickers Ltd Armament Division, was developed by the Royal Armament Research and Development Establishment using the Ordnance, QF 105 mm L13 of the Abbot self-propelled gun as a starting point (it used electrical primers).

6. 14.5 × 114 mm - Wikipedia

   en.wikipedia.org/wiki/14.5_×_114_mm

   The 14.5×114mm (.57 calibre) is a heavy machine gun and anti-materiel rifle cartridge used by the Soviet Union, the former Warsaw Pact, modern Russia, and other countries.. It was originally developed for the PTRS and PTRD anti-tank rifles, and was later used as the basis for the KPV heavy machine gun that formed the basis of the ZPU series anti-aircraft guns that is also the main armament of ...

7. BL 7.5-inch Mk II – V naval gun - Wikipedia

   en.wikipedia.org/wiki/BL_7.5-inch_Mk_II_–_V...

   The BL 7.5-inch Mk II–Mk V guns [note 1] were a variety of 50-calibre naval guns used by Britain in World War I. They all had similar performance and fired the same shells. They all had similar performance and fired the same shells.