@GI

Read about the poor performance of the 24th Infantry Division during the Korean War. Don’t bother with any accounts published after the 1980s. The closer you can get to the wartime, the more honest they will be.
 

While the 24th Infantry Division was indeed in Korea, you're thinking of the 24th Infantry Regiment of the 25th Infantry Division. The regiment was a black unit and the 25th had the misfortune of having it as an assigned unit. I recall veteran and author David Hackworth, himself a 25th Inf Div vet, writing about the 24th Inf Rgt, hit by the enemy and collapsing on multiple occasions and then the front line had to be restored by the division's two (white) infantry regiments.

After the performance of the 92d Infantry Division (Negro) in Italy during WW II, what happened with the 24th Inf Rgt in Korea probably did not come as a surprise.

Black units often had both black and white officers; however, white officers definitely did not want to be assigned to black units. Besides the difficulty of dealing with black soldiers, it was an unofficial rule that if you, as a white officer, were assigned to a black unit, you probably weren't too sharp as an officer, so the Army was putting not-so-hot white officers with blacks. Even if you were a very good officer and you were only assigned because the opening needed to be filled by someone, it still wouldn't look good on your record and might very well damage your career prospects.

It wasn't too long into the Korean War that the division commander called for the inactivation of the regiment, calling it "untrustworthy and incapable of carrying out missions expected of an infantry regiment." Probably the only thing keeping it on the rolls was the fact that the Army needed every warm body it could find to hold off the North Koreans and Chinese. Nonetheless, the regiment was relieved from the 25th Infantry Division on 1 August 1951 and inactivated on 1 October 1951, seemingly forever.

The black soldiers didn't get to leave Korea because the regiment was inactivated. Instead, they were sprinkled around other previously all-white units, the idea being that in small numbers within white units, they might perform up to some sort of standard. (Certainly the all-black system hadn't worked well.) Also, having two separate personnel systems for assigning whites to white units and blacks to black units was awkward to maintain.

These days I suspect the same idea led to assigning women and trannies to combat units. Those in charge know they can't be expected to perform up to the same standard, but having a limited number of weaker soldiers among the others as seen as the only alternative. While all-male units have long worked well, certainly all-female and all-tranny units would quickly lead to disaster. So, the women and the trannies are sprinkled throughout previously all-male units and the sharper and stronger male GIs are expected to pick up the slack.

Back to the 24th Inf Rgt... During the Clinton administration years, long after the Korean War (and after most people directly involved were no longer alive and others had simply forgotten), veterans of the 24th prevailed upon the Democratic administration to reactivate the colors of the 24th, since "as we all know," the only reason the 24th was inactivated in 1951 was because the unit was being picked on and discriminated against because it was black. (Yeah, right.) So, the 1st Battalion, 24th Infantry was reactivated as part of 1st Brigade, 25th Infantry Division in 1995. Today 1-24th is active at Fort Wainwright, AK, as part of the 1st Brigade Combat Team, 11th Airborne Division. (The 11th has only two BCTs and only its 2d BCT is actually Airborne. Its 1st BCT is entirely non-Airborne but still wears the division shoulder patch.) 1-24th is no longer an all-black unit, but still, what white guy who knows its history would want to be assigned to it?