Not sure about WWI, but for WWII: "The crew numbers aboard a U-boat varied greatly between different U-boat types and the mission it was undertaking. A Type II U-boat comprised of 25 officers and seamen, while a Type VII housed approximately 45. A Type IX had about 50 and Type XXI had a 57 man crew."
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Primarily over 2,000 merchant vessels, with a sprinkling of allied warships.
I guess you mean to ask what was the number of regular "crew" members of a Lancaster? As the Lancaster could have carried many more people without its regular payload (Bombs and fuel).Anyway the answer is seven (7) as follows:Bomb aimer/Nose gunnerPilotFlight engineer/Co-pilotNavigatorRadio operatorMid-upper gunner andTail gunnerIn some specialised missions the crew members were reduced and in a few a couple of extra specialists were carried aboard.
The first Brittish Battle Tank Mk1 1916 had a crew of 8 see related link
The USS Oriskany was an aircraft carrier. It was in both the Korean and Vietnam War. It was designed to hold between 90 and 100 airplanes. It would hold up to 2,600 crew members.
6-7