NO! Do not retire the 1911 or .45 ACP! I have the utmost respect for Massad Ayoob, his experience, training, and expertise. Thank you Massad, for this excellent article specifically on the 1911, and generally on .45 ACP ammunition. I would carry my 1911 except I am a fan of more ammo. Allow me to share that in 30 years of law enforcement for a large California metropolitan department, I've seen many Officer-Involved-Shootings (OIS) involving use of .38 caliber and later, 9mm ammunition. While 9mm is certainly better than the .38 caliber (semi-jacketed lead hollow point) wheel gun I was originally issued, in many cases, a suspect shot with .38 caliber or 9mm simply did not go down (sans a head shot). Even with multiple hits, sometimes the suspect continued to fight, flee, and just stay alive. Just witnessing some of these shootings and seeing suspects hit, fall down, and (incredibily!) get up to run and/or fight again, has jaded my opinion on 9mm ammo. While there have been incredible advances in 9mm ammunition, the 9mm projectile is essentially the same diameter as .38 caliber, albeit with improvements. Allow me to openly declare; I have no empirical evidence to support my opinion. However, I do not believe suspects would have continued to fight, flee, and live if a .45 ACP 230 grain hollow point round were used. I carry a Glock 21 as my EDC loaded with Federal, Personal Defense, (Bonded) .45 ACP+P, 230 Grain, Hollow Point Ammo and always carry a spare magazine. I carry the +P as my research indicates 45 ACP ammunition can, in some cases, be too slow for full expansion, as it was designed. The +P, being higher pressure and faster in feet-per-second (fps), will (hopefully) solve any expansion related issues, based on my research and my humble opinion. I could not agree more with those who say that "shot placement" is the key in any shooting situation where you want to take a suspect down. Without doubt, shot placement is more important than most caliber and ammo decisions. I practice regularly with 230 grain ammo and I shoot center mass followed up with head shots for every two to center mass. I have no illusions that in the frantic shooting situation, there may not be time or opportunity to take a controlled head shot but I still have more faith in .45 ACP+P for its knock down and stay down power, no matter where as long as its center mass. Lastly, with thugs being high on meth and a variety of other chemicals, you simply cannot have too much knockdown, penetration, or fire power. I wish all law enforcement would carry the .45 ACP+P but politics are politics. Having said all this, allow me to say I would carry a 10mm if not for the excessive danger of over-penetration. However, when hiking in bear country, I carry 10mm. My contribution on this topic; for what its worth. Stay safe!