Hello
not necessary, British, Germans, Finns etc. had LMG(7,62 - 8mm), 20mm, 40mm and then heavy AA (75mm and bigger) and US had HMG, 37/40mm and heavy AA (90mm, early in the war 3" (76,2mm)). HMG (12,7 - 14,5mm) cover more or less same role than the LMG plus 20mm combination.
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