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If Congress has controlled the exact size of the military ... thick and thin ... through legislation (which no one to my knowledge has challenged as unconstitutional), then what's the necessity for a much more cumbersome amendment process?
I mean this regardless of what the actual size ought to be. You want it either reduced or enlarged, it's a lot easier to go the legislative route (as was done in the early 90s to reduce, and the past couple years to increase end strength).