Interesting subject
I can't speak for the US military, but as a former british soldier, i used a Eka super swede for years as my folder and a buck nighthawk as my fixed. I have friends still in, and a lot use the gerber lmf and mora's as for folders, a lot use swiss army knives and gerber folders. When i was in belize in the 90's i had a issue kukri, and when i was in afghanistan/ iraq i bought a sog sealpup in a px, but lost it in a shooting match, and its probably on the beltkit of a terry taliban now haha....in short, in the units i served in nobody cared what you carried...