They want low recoil for women troops and/or non-experienced males, penetration of body armor (although maybe not the solid plate armor which even a rifle won't penetrate), high capacity magazines, etc. Lightweight ammo wouldn't hurt either.
I'll make a broad statement and say that for the USA, the 20th Century belonged to the .45 ACP - an auto pistol version of the "big, slow and heavy" .45 Colt. Perhaps in the 21st Century it might be time to look at the 5.7x28.
Uh huh. What do you think the stopping power is like when you can put a 3 round burst into a BG's eyeball at 25 yards?
