Been there too, a SAK with scissors is the first choice, keep that in the shave kit. In the field, a decent folder under 4" inches. No fixed blades as real estate on web gear is at a premium with all the required items attached. After that, just lugging 45 pounds of gear, plus a vest, plus weapon, plus helmet, plus a share of the team's gear, it adds up. A big one pound knife with a huge sheath (as marketed to all those who don't go) is exactly what nobody actually carries.
First of all, the M4 is the primary weapon, even up close and personal, it has more reach and impact than a knife. Second, most of what the soldier sees daily doesn't need a knife. MRE's open by hand, ammo crates are wired and open by untwisting by finger pressure alone, etc. There really is very little to cut, usually paracord that was strung up inside the hooch to dry your socks or position a fan at the right angle.
2001 was an interesting year, two weeks in training, two weeks in the box at Polk, two weeks in Egypt, and the next February, three weeks in Dix followed by 7 months in GTMO. I used the SAK scissors more than anything. I left the larger blades behind simply because I already new I didn't need them, and as it turned out, I didn't. The only time I needed a multitool was filing off the rivets to open up a Master padlock that was protecting the only key for it.
The only soldiers I've seen in the last twenty years who choose to carry a large blade or hawk do so because they are a small elite unit with unusual missions - they tailor their gear each time to the specifics of the mission. Joe Grunt doesn't get that option, he carries what he's told, and anything extra is usually small and out of sight. Most of the time it's dead weight. Put some miles on your moccasins, and the idea of a fixed blade is casually dismissed, just the same as it was in the Civil War - all those pre campaign photos show prop knives, not what was actually carried and needed.
Streamlight Microstream AAA, a SAK Pioneer, and Benchmade Risk in all black would be a better set than any fixed blade he can't or won't carry.