I tried uploading pages from my 1913 Small Arms Manual. This is as early as I have found to bolster my claims of "original" intent on the carry of the M1911 pistol. Firstly was the directions on how to load, which was to rack the slide and put the safety on. Then, if you were going to holster the pistol, you took the safety lock off and lowered the hammer. Then you put it in your flap holster.
MG Hatcher knew Mr. John Browning, and in his book "Text Book of Pistols and Revolvers" claimed the safest way to carry a M1911 was with a round in the chamber and the hammer down.
There are some differences between the military, and the quick draw McGraw expectations of civilians. We have been taught, through tens of thousands of hours of watching movies and TV shows, the "Big Man" concept of history. We expect the Big Man, standing alone, against the evil hordes, to overcome them with his lighting fast reactions, and quick reloads. Anyone remember the Walk and Draw era where everyone knew that the man who cleared leather first always won the gun fight? I still see this in modern Western Movies. The good guy, the bad, guy, walk down the middle of the street, and the first one to clear leather always wins. Self defense classes and self defense "games" reinforce this. One of the bad tactics taught is running through a room of armed men in an attempt to clear them all before the timer goes off. That is incidentally, a great way to get killed.
I talked to a Veteran of Iraqi/Afghanistan about his experiences reloading his M4, and whether he could quickly reload, and the guy said "you don't understand, I have 16 other men in my squad". He was right, I did not understand. While he is removing his magazine, he has 16 guys around him, almost all of them with fully loaded weapons, and they are going to eliminate any threat to a member of the squad, without having to be asked!
I did not ask, but I assume instead of running through a room of armed men, he would have tossed a grenade or two in that room. Or maybe, stood back and shot an AT-4 from 100 yards away and let that rattle the rafters. And in a worse case scenario, called in the friendly skies. I think they still use Napalm, don't they? Ever heard the joke "What comes out of a forest fire?" "Crispy critters!"
Anyway, when the M1911 was the service pistol, you loaded it as you were told, you carried it as you were told, and once you got into combat, you were not going to walk down the middle of anything and try to out draw someone in a classic Western style gunfight.
And I don't trust the M1911 safety, and I sure don't trust the extended and ambi safeties out there to be "On", when I expect them to be "On", nor do I trust them to be "Off" when I expect them to be "Off". Sometimes they are "On" when you expect them to be "Off", and sometimes they are "Off", when you expect them to be "On". And that is the greatest concern I have about carrying a M1911 cocked and locked. It might just be, cocked.