Not the same thing as a M-15 nor the same purpose.
What I posted wasn't my supposition or WAG. The question was addressed at both the USAF SP school and at the USAF Armorer's school. At one of those schools, can't recall which, it was one of the test questions. The reason given both places was the oversized trigger made it easier to access wearing gloves. The oversized trigger allowed better access to the trigger wearing heavy gloves. You didn't need to get your finger completely inside the trigger guard wearing gloves with the target trigger where the standard trigger took a bit more effort.
Same reasoning for the target hammer. The oversize gave more purchase area when wearing heavy gloves.
Whether a person agrees with it or not really doesn't matter. It was the USAF's reasoning at the time.
I must say, this was new to me. I was an Air Policeman in the 1960's, before the term SP came into use. I thought the target hammer and trigger were ordered by Curtis Lemay in hopes of giving his troops an advantage in qualifying, which was hard for many. The larger hammer and trigger were meant to assist in cocking the gun more easily, and hopefully aid in improving scores.
Personally, I prefer the standard hammer and trigger, and feel sure that they'd be preferable with gloves. But all the issue M-15's that I saw had the target stuff on them.
We were often short of the M-15's, priority being given to SAC and our forces in Vietnam. Victory Models and a smattering of Colt .38's were widely used, as well as a few remaining .45 autos.
We were were taught to use both SA and DA firing modes. If memory serves, we were told to shoot SA beyond 15 yards.
It is true that most airmen had little experience with firearms, and many were afraid of them. The Air Force impressed me as being somewhat weapon-phobic, as far as small arms were concerned. Troops bound for Vietnam did get additional training, and acquitted themselves very well during the Tet attack on Ton Son Nhut Air Base in 1968.
I knew a few other "gun people" in the Air Force, but we seemed in the minority. And I think I was the only one who studied how to use a knife to kill the enemy, if need be. I had one of the first Gil Hibben fighting knives, and a Model 3 Randall. Carried a Boy Scout (later, a Swiss Army) pocketknife. Never went to Vietnam, in spite of applying for that. But I did serve at a remote air base in Newfoundland, where I found absolutely no one well prepared to repel a spetnatz attack from a Soviet submarine. My auxilliary personnel, in most cases, could barely recall how to operate the .30 M-2 carbines that we had. And they didn't want to learn, as they'd have had to qualify, and to clean the weapons. That was regarded as unpleasant duty.
T-Star
P.S. I was an Outstanding Graduate of Air Police School, and was cited for academic achievement. I do not recall ever being told why the target hammer and trigger were adopted on the Combat Masterpiece. But they may have added that info later.