He will probably be issued a Gerber multi-tool. In my 14 years of fobbit life I've been issued at least four of them.
I don't have an SKU, but the fancier larger model Multi-tool with the front sight post adjuster also had a flathead blade that's closer to what you want for an M68 CCO or ACOG to adjust those sights. I've seen them and been jealous, but I've never seen one of those issued. So that's a good idea IMHO if you want a truly utilitarian gift.
If you want to buy him a high quality fixed blade knife, I'd second @blues and his recommendation of Carothers Performance Knives (CPK).
They are incredibly high quality custom and semi-custom knives . The specific Delta 3V steel and heat treat used by the maker makes every other knife I've ever owned look like a flimsy butter knife.
My father is hopelessly addicted to custom knives, and he gifted me a CPK 'Utility Fighter' or UF before my turbo-fobbit deployment in 2019. While I never used it to slit throats, I used it to great effect cutting apart basically everything that ever needed cutting, including the hopelessly tangled and destroyed flight webbing over an ISU-90 container of ours. That webbing is some seriously stout stuff. The guy at the CRSP yard left to get bolt cutters to cut it and by the time he got back with them, I'd done half of that webbing by hand with the CPK and it showed no signs of getting dull, which left him and a USAF E6 TSgt there astonished.
It's a knife that I found useful both in size and design for utility stuff, but I'd quite happily carry it into harm's way as well.
Another suggestion I'd make is a Clinch Pick or a Moore BoB or similar small fighting knife, and a trip to an ECQC class.
It's stupid easy to hide a clinch pick in an IOTV or on a beltline in uniform, and it'll be an ever-present entangled fighting weapon that weighs basically nothing and takes up very little space.