40 mm anti-aircraft shell? - FIREARMS - U.S. Militaria Forum

We are cleaning out my mother-in-law's condominium and found this item in a trunk in the garage. I did a little snooping on the Internet and it looks like it's a 40 mm antiaircraft shell casing. The stamp on the head of the shell near the primer is 1943. The shell was in a round tube and the cap

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40 mm anti-aircraft shell? - FIREARMS - U.S. Militaria Forum

OSS Weapons - Page 2 - FIREARMS - U.S. Militaria Forum

WWII U.S. Navy Bureau of Ordnance 40mm Cannon Ammunition Display Board - ORDNANCE - U.S. Militaria Forum

USN 40mm Saluting shell - FIREARMS - U.S. Militaria Forum

Anti-aircraft warfare - Wikiwand

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WW1 75mm Shrapnel Shell w/ lead balls. - ORDNANCE - U.S. Militaria Forum