please don't sell that fool's gold
first off, the army e sports team is a recruiting method - its OBVIOUSLY not an initial entry type of deal where they sign some dude off the couch, put him in a uniform, and tell him to get his 360 no scopes popping. Its part of their PR department, and as anyone can tell you its hell to get into and hell to stay in. Both the USMC and Army are going on Twitch and Youtube right now looking for content creators to promote for them and just change the image up a bit. They don't need a kid off the street to fit into that box and they're not looking for that either. In regards to PR and such, they want admin, recruiters, and salesmen to interact with the civilian businesses and contractors who absolutely do the job better than they ever could.
Also, if you do manage to be that guy to force yourself in the door regarding graphic design - then you should be able to force that door open as a civilian FAR easier than at a recruiting office. Army contracts half the shyt you're talking about. The jobs you're describing won't even show up on a recruiters desk or even at the end of ROTC
Army's got boxing, singing, modeling and all kinds of shyt... doesn't mean that its ever going to even show up on your radar even after being in for 10+ years.
I'm usually the main one telling guys to entertain the military option if they've got nothing going on but this kid is 22 years old and already sounds like he got some mental shyt cooking up that he needs to work out or at the very least properly identify first....
If you want to pursue art in the military, you do it through experience and branching out. Life by itself is gonna sharpen that tool and the military will give you plenty of it whether you decide to stick with art or not...