Dave & Brian,
The Air Force Office of Special Investigations (OSI) carried the gun Dave eluded to. It wasn't exactly as he described but close. Gen. Curtis E. LeMay (famous Commander of the Stragic Air Command) actually designed the gun and the Air Force Armory at Lackland AFB, TX built them. They took standard issue 1911A1 GI 45's, cut the slide and barrels to 4.25" (same as a Commander) then cut an inch off the bottom of the grip. It was issued to all 2500 OSI Agents world wide and came with an Alessi hi-ride holster and an Alessi magazine holder. Each gun had two standard 7 round GI magazines and one special 6 round magazine with a finger rest (carried in the gun). From 1980 to 1985, OSI agents, yes even the petite females, carried this gun cocked & locked with a total of 21 rounds of GI 230 gr ball ammo. The OSI 45 replaced the S&W Mod 36-3, a 3" Chief Special (38 Spec). This semi-worthless gun wouldn't hold up to the GI 130 gr +P ball ammo. In 1985, OSI turned in their 45s for Berettas (GI version of a 92). They carried one spare magazine which gave them 30 rounds vs 21 with the 45. They lost on raw power, concealability, and tradition. All Agents had to be retrained on the "first shot D/A" concept that many grew to hate.
I was with DOJ during that time period and worked very closely with OSI. We tested several of their guns for function, safety, accuracy, and reliability. The guns were great and passed all tests. We tried to get them transferred to DOJ when OSI got rid of them but no luck. I wasn't real fond of the short grip but I must admit they shot very well.
Finding a military sidearm that fits all needs is nearly impossible. Consider the different climates, uniforms, size and weight restrictions, compatability with NATO, air, sea and land, on and on. Soldiers, Sailors, Airmen, and Marines all have different needs. Within the forces are Special Ops, Seals, Rangers, pilots, etc. I don't think anyone could come up with a better gun than the good old 1911. If it weren't for Geneva Convention restrictions on ammo, 38 Super, 40 cal, or even 9mm would do fine. Unfortunately, one of the only cartridges that doesn't need to mushroom to be effective is the 45 cal. Any chosen gun would have to be simple to operate, disassemble / reassemble, and would have non-precision parts that would be field replacable without gunsmithing. I'd vote for a Commander sized gun in 45 ACP.