What parts of the military law did Will Smith's character in "Independence Day" violate treating his prisoner?

Well, unless his alien prisoner was read his rights that were not shown in the movie he would have been given the opportunity to get his own alien attorney. But I remember that the alien was hostile towards him so Wil's character had authority to use excessive force. But if you remember while he was in custody the prisoner ended up killing three people so I believe he did nothing wrong with the way the prisoner was treated.