I was 11B (Light infantry) 11H (anti tank infantry/TOW gunner) I started out with a Leather Man and then went to a Gerber multi tool, I made the switch because I could open the Gerber one handed. also cared a Gerber Gator, again one handed opening and it was a serrated in the back with a smooth edge in the front. In the field I added an old timer out fitter knife (141OT) to my web gear. We wear issued bayonets but the only time it came out of the sheath was to cut constatena wire and to wipe down at weapons turn in.
I dam near built a humvee with my multi tool our "gun" system was truck mounted and I used every part of that tool between field expedient repairs, and steeling parts from the headquarters trucks (those ass holes got parts ant time they, wanted but I got chewed out regardless if our parts wear back ordered). The gator mostly cut 550, opened MRE's and that sort of thing. The old timer cut saplings for cammo, and did every thing the gator did when I could get to it first. We wore TA-50 web gear with suspenders instead of the molle gear so it was hard to get to anything that was not hung on one pistol belt.