I'm not in the military, but I've worked as a translator for Argentine, Spanish and Israeli troops in UN missions and training exercises.
There's a relatively new brand in Argentina called Yarará (a local poisonous snake) that's quite popular with servicemen. They've made some special models for army units, SWAT teams, etc. A few years ago their knives were, in my opinion, utter rubbish. But they've improved. I still think their tactical line is rather crude, but I was given a couple of their more traditional blades to try out and have to admit they worked quite well. Soldiers like them because they're tough and affordable. Keep in mind our army hasn't been to war since '82, so field testing is limited to training and peace keeping missions.
www.cuchillosyarara.com.ar
The Spanish units I worked with had Aitor fixed blades (Oso Negro is the civilian name) and Aitor folding knives, the ones that look like big SAKs. Some of the newer guys got Chinese versions of the Aitor folders and weren't very happy with them. I got one with the army emblem on the handle as a gift.
Zapadores paracaidistas (airborne engineers) had a different knife made at the Toledo weapons factory. Weird double edged knife, they attached a lot of sentimental value to it. They are very sought after by Spanish civilian collectors and a few companies have made civilian reproductions.
The Israelis had a big mixture of knives, nothing seemed to be standard issue other than the bayonets. A captain who is a good friend of mine and a knife guy, bought a number of SAKs with the star of David instead of the Swiss cross (they were Victorinox Tinkers, if my memory isn't tricking me). They did have US made bayonets, but didn't seem to carry them often. This was a reserve unit.
I also met some folks from a couple of the sayerets and they were much more interested in firearms than knives, there were a couple of nice folders (Spyderco and older ats34 Gerbers) and the only guy I met with a large fixed blade carried a Randall 1.
Needless to say, I was soon the official sharpener for whichever unit I was with. Some of those knives needed a bit of time on a belt sander.