3-inch anti-aircraft gun M3
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The 3-inch anti-aircraft gun M3 was an American anti-aircraft gun which served throughout the 1930s and into early World War II. Developed from the earlier 3-inch M1917 and 3-inch M1918 guns,
it was in the process of being replaced by the time of the US entry into World War II, but was subsequently adapted into an anti-tank gun role, both free-standing and in a self-propelled tank destroyer. It may have seen action in the Pacific Theatre.
A 3-inch M3 anti-aircraft gun on a M2A2 carriage, preserved in Brazil
The predecessor of the M3; the M1918 in traveling position.
No. 2 Gun Crew, Btry D, 208th CA AA, man their 3-inch AA gun at New Fighter Strip, Dobodura, New Guinea (17 May 1943).
Secretary of War James W. Good inspects an M3 in traveling position near the White House in 1929.
90 mm gun M1/M2/M3
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The 90 mm gun M1/M2/M3 was an American heavy anti-aircraft and anti-tank gun, playing a role similar to the German 8.8cm Flak 18. It had a 3.5 in (90 mm) diameter bore, and a 50 caliber barrel, giving it a length of 15 ft (4.6 m). It was capable of firing a 3.5 in × 23.6 in shell 62,474 ft (19,042 m) horizontally, or a maximum altitude of 43,500 ft (13,300 m).
A 90 mm M1 at CFB Borden
M7 gun director, 1944
An experimental 90 mm anti-tank gun
90 mm M1 gun on T3/M3 seacoast mount at Battery Parrott, Fort Monroe, Virginia