But many militaries carried the .38S&W, .32ACP & .380ACP as military sidearms. Does that make them optimal choices?
Notice all the 3x's in your question? None of them start with a 2X... A pistol is never a best choice in the military, its usually carried by officers or senior NCOs. A military pistol is under the usual definition is a defensive only weapon, unless your part of some special whatever. Use whatever is legal and suits you, your life and your choice.