Unknown_To_All
I wish I picked up this novel sooner so I could give tech recommendations because I am not a fan of giving the military weapons either. The military in the Marvel Universe is notorious for going against the supes and giving corrupt guys a change to slip away. Especially since there are mutants in this world. The military is always the first to target the mutants. But I look forward to how to deal with these issues in the future. Here are some tech recommendations that can help the MC get rich: Capsule technology(DBZ) - Can transport anything no matter the size, Animus( Assassin's creed) - Gaming and military training will never be the same, Scroll(RWBY) - cell phones will obsolete, cyberware and implants(Cyberpunk) - Doctor connors no longer need to regrow his arm, Gates(Stargate SG1) - Now everyone can travel like the sorcerers, and for Specialty armors( warframe and Anthem) - Suits that are already super in case we want to give the supporting cast some abilities. There is a bunch more I just cant think of right now. I will comment them in the future as they come to mind.
The MC can provide equipment and weapons to armies all over the world, just don't overdo it, always keeping one or two generations at most of what they currently have. This way he would not arouse suspicion, he would supply many and not just one country, and he would have profit and political power.