US Repro M1942 Aluminum Canteen with CupIn 1910 before the outbreak of World War I, the US military shifted away from the old hemispherical canteen design and came up with the 1 quart canteen. During World War 2 the US would change the materials to steel (since aluminum was much more needed for aircraft production) and make small production differences. During 1942 one of the main visual changes was the cap they went from a aluminum cap to a black plastic resin cap. The 1 quart canteen got