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While I do get the historical reasons for their existence, many nations do not segregate their militaries the way the United States does. Few people here, for example, would mock the military effectiveness of the IDF in full combat, and yet the IDF operates as a single military unit that merely has multiple internal "wings". All training is joint, and a unified command structure makes them highly effective. Similar structures exist in other nations all around the world. It's also MUCH cheaper to operate, because you're eliminating the redundancies you just described.
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