:welcome: to the forum!! Wow - a military is certainly a big step! They are great birds, the biggest suggestion I can give is to offer a consistent routine, try to socialize them well, and don't let yourself be intimidated by the beak
I haven't worked hands on with Militaries, so I don't know their quirks compared to other Macaws, but I've worked with Macaws in general (B&G, Scarlet, Green Wing, Mini's, etc) as well as own a Severe and those are the big things people tend to forget/have issues with.