I’ve roasted coffee beans over a campfire. It is easy, but you have to stir the beans for about 20 and be alert when they start to crack. The historic articles I read said the roast was often screwed up.
You’ll have to point me to those articles, because I just don’t helieve it. It is not a factor to get an enlisted guy to roast coffee, (possibly an officer ...:) it will be so much better than any “portable” coffee, freeze dried, dehydrated or any field expedient concoction they could have come up with, and it isn’t even going to be close.
Roasters aren’t exactly rocket science either, after all. A metal drum with some holes, a hand crank, and Bob’s Yer Uncle.