Your intent is wonderful and I appreciate the reason behind the gift.
The knife, however, won't be carried in the field or used. Very few in the Armed Forces do. The reality is that loaded out with 85 pounds of gear, a battle rifle, possibly an auto pistol, communications gear, etc etc, the addition of another 16 oz of war material gets intense scrutiny.
I did that - carried either a Glock "trench" knife or a Gerber Mk II in Officer Basic, there were maybe a dozen others in our class of 100, and for the most part they were useless. If we needed a weapon we were already lugging around an M16 and plenty of ammo which weighed us down. If we needed a big blade we had the e-tool which is sharpened on one edge. I was in Infantry, in discussion with others who weren't combat arms, they spent as little as two days in the field. Mine was 85% in the field. Depending on the Branch he accepts he may be overdressed with a 4" lockback.
A "combat knife" for graduation is a largely ceremonial gift with little current application to the actual needs of a field soldier - and most do not actually live in the "field." They run things in a "green zone" behind wire with their weapons racked at their work area. It's the combat arms guys who go into unfriendly territory and for the most part if that is his job he will be assisting the platoon sergeant in directing troops to engage the enemy while communicating on the radio.
I pretty much sold off my Gerbers, Randalls, Swamp Rats, and other "commie killer" knives over the last ten years simply because they didn't do anything except appreciate in value - because they were largely unused and the popularity immensely exceeds their value as a combat weapon. I now rely on more utilitarian blades for the most part, simple clipped locking liner knives in the $50-100 price range which I can afford to misplace and replace where ever decent knives are sold. Losing a $400 knife would be intense - i misplaced my Strider SnG for a month and vowed never again to buy another expensive knife. They are nice - but a $250 knife is not 5 times better than a $50 knife in any respect other than resale.
Better a six blade Swiss Army with scissors and woodsaw, a quality multiplier from Leatherman, and a 4" clipped liner lock. You get a lot more usefulness from that triple threat combination. And these days, none of them are even needed to open up an MRE. Tools are much more rarely required for a soldiers personal upkeep.
Except those scissors. They come in really handy and you are not likely to give yourself a 5 stitch injury with permanent nerve damage. Don't ask how I know.