P.S. The reason the US Military went to 9mm was to standardize with NATO protocol. Besides, is my dream gun is a .45 Winmag. Gonna be my next gun....lol!
And that's the reason my firearms are (in ascending order by caliber) .223, 9mm, .50BMG and 12 gauge.
Sorting by cartridge length would result in a different order. :^)
If the fit hits the shan then ammunition for all of the above will be field-available.
When the military changes, then I will, too.