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2. 2nd Battalion, 10th Marines - Wikipedia

   en.wikipedia.org/wiki/2nd_Battalion,_10th_Marines

   2nd Battalion 10th Marines (2/10) is an artillery battalion of the United States Marine Corps comprising two cannon batteries, three rocket batteries, and a headquarters battery. The battalion is stationed at Marine Corps Base Camp Lejeune , North Carolina and its primary weapon systems are the M777A2 howitzer [ 1 ] with a maximum effective ...

3. 5-inch/51-caliber gun - Wikipedia

   en.wikipedia.org/wiki/5-inch/51-caliber_gun

   5"/51 caliber guns (spoken "five-inch-fifty-one-caliber") initially served as the secondary battery of United States Navy battleships built from 1907 through the 1920s, also serving on other vessels. United States naval gun terminology indicates the gun fired a projectile 5-inch (127 mm) in diameter, and the barrel was 51 calibers long.

4. Dual-purpose gun - Wikipedia

   en.wikipedia.org/wiki/Dual-purpose_gun

   The French Navy used a mixed-calibre system, as well, but their secondary battery was dual-purpose. This tended to complicate ammunition supplies and render certain armament useless in some situations. Dual-purpose guns are designed as a compromise between the heavy main armament of a surface combatant and dedicated anti-aircraft guns. Usually ...

5. World War II Facilities at Midway - Wikipedia

   en.wikipedia.org/wiki/World_War_II_Facilities_at...

   The atoll's two main islands, Eastern Island and Sand Island, were both fortified by the Navy. Eastern Island, the smaller of the two islands, had three runways in a triangular configuration, and was defended by six coastal and dual-purpose batteries, armed with 3-, 5-, and 7-inch guns.

6. 3-inch/50-caliber gun - Wikipedia

   en.wikipedia.org/wiki/3-inch/50-caliber_gun

   Although intended as a one-for-one replacement for the 40 mm mounts, the new 3-inch (76 mm) mounts were heavier than expected, and on most ships, the mounts could only replace Bofors guns on a two-for-three basis. The mounts were of the dual purpose, open-base-ring type and the right and left gun assemblies were identical.

7. List of coastal fortifications of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_coastal...

   The 16-inch batteries would be complemented by 6-inch (152 mm) guns on new high-angle shielded barbette mounts with magazine bunkers, and new 90 mm (3.5-inch) dual-purpose gun batteries. Due to the diminishing threat of enemy surface attack as World War II progressed, especially on the east coast , of 38 16-inch batteries proposed only 21 were ...