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That isn't necessarily an issue. The US uses their own designs as well, so if you count them, you can add an additional 1 or more to every category. You have the Abrams, as well as the F-15, F-16, A-10, C-130 and AC-130, B-52, B-2, Bradley IFV, Striker IFV and variants (if we still even use those), M109, etc. Even between different branches of the military, they use totally different designs for the same role. The army, air force, and navy all use Blackhawks for their transport helicopter, but the marines use Super Hueys, a refit of the Vietnam era Huey. Even the Abrams has multiple variants, such as the short barrel one that's been used in the forever war in the Middle East, as well as tons of armor kits and equipment packages produced by different companies. Hell, the world's first purpose-built sniper rifle that wasn't just the best firing of the infantry rifles they had on hand was built by 2 guys in a shed in England who made match rifles for shooting competitions, and the current US sniper rifle is a civilian hunting rifle.