More than likely he’ll take it to the field a couple times then it will sit in his wall locker so get him a keepsake….every grunt should have a Randall Model 1 or 14
Unless he is a knife guy and wants to carry a fixed blade I would also advise a good multi-tool in black oxide finish. Every grunt I have ever worked with loves those. Also carried by every Infantryman is a sturdy folder. Not necessarily a tank like ZT but more importantly a durable pivot and lock and a not fragile tip. Because every grunt ends up using it as a prybar. A durable folder from a company with a great warranty will last him a career. If he’s definitely into fixed blades a small lightweight fixed blade, again, from a hard use maker will make him happy.
I love fixed blades and, after one week long field exercise with my K-bar, never carried one again. In over 20 years of the Marines, the only thing I ever used a fixed blade for was opening MREs. I was never without a folder and often used a multi tool.
An Emerson. CQC 7, he will use a folder more than anything. Got to open MREs and stuff. Fixed blades are cool, but will rarely get used. He won't be knife fighting Tommy Lee Jones trying to retake a ship.
https://emersonknives.com/
I carried a version of this https://www.kabar.com/products/2225 through Desert Storm/Shield. It was a handy mre opener and not much else, it spent more time riding in my ruck than on my LBE. I would have been better served with a quality folder and a multitool. An issued bayonet will do all the stabbing and slashing one needs.
Winkler, Spartan or CRK.
A way to and knowledge of how to sharpen?
Last one I gifted was a Loveless-pattern Chute Knife made by John April to a freshly qualified Airborne Infantryman. That went along with a Leatherman multi-tool.
The latter of which gets used regularly, the former looks good mounted to his LBE and was the envy of his comrades at the time.
I chose the Loveless pattern for its classic good looks, balance, and overall size to weight ratio. That said, if I were sending someone out tomorrow, I'd grab a spare ESEE 3 from my pile and send it along. There are lighter/better options probably, but for the price it's tough to beat. An ESEE 3 and multi-tool combo would serve most any soldier well.