I found this answer
YES - there are copyright issues. Every Service now has a Licensing Dept at the HQ level. You have to participate/sign their agreement, which basically states that they own your art (ie: your version of the USMC EGA on a mug or shirt).
Unverified but the problem I see is that they are not going to the poster, they are going to Steve with warrants in one hand and the other outstretched looking to be filled with $$$$$$
I would keep this one private.