U.S. Army TACOM (Tank-Automotive and Armaments Command) has ordered another 20,000 Beretta 92FS 9mm pistols. These will cost $410 each. The M9 is a 34 ounce, 8.5 inch (217mm) long weapon that has a 4.9 inch (125mm) barrel and a magazine that holds 15 rounds. It replaced the M1911 .45 (11.4mm) caliber ACP. This was a 39 ounce, 8.25 inch (210mm) long weapon with a 5 inch (127mm) barrel and a 7 round magazine. Both pistols were only accurate at up to about 50 meters. The M1911 had more hitting power, while the M9 was a bit more accurate.
The post points out that many military personnel who carry a pistol for combat use, rather than as an emergency survival tool, elect to carry a .45 instead of a 9mm. I will add that often this is done by using personal funds to buy the weapon rather than carrying an issued sidearm, and that it is frequently against unit regulations. Holsters with flaps that conceal the identity of the weapon are popular for this very reason.
Soldiers and Marines don’t do that unless they’re pretty sure it’s the right thing.