Welcome! Lots of macaw-lovers here to help you out. While we're waiting for the experts, you can take your key words, and use the Search Tab to look for previous threads on the subject, and then read about it. It's a really good engine.
Agreed. Search the forum especially for anything posted by birdman666, who has extensive training experience with all types of parrots. He has definite opinions of certain species of macaw, military being one of them I believe.
He's beautiful. The ad looks like somebody who wants to do right by the bird by getting him to a home that's better suited. He certainly doesn't have that many toys, but he may not be completely neglected and unsocialized either. Military macaws can be difficult, but if you're experienced with big birds, he's definitely worth going to go take a look at.