"White heterosexual men that are non injection drug users in the US are at a much lower risk for hiv?" If such men also have not been incarcerated and are not immigrants from HIV endemic areas, fewer than 1 in 1,000 has HIV, maybe only 1 in 10,000. And it would have been even lower several years ago.
I meant to say that although general STD testing isn't done automatically in the US military, all service personnel have HIV testing at least when the join up and, I believe, periodically (yearly?) thereafter. The chance your Navy partner had HIV is near zero. Same for the guy who assaulted you, especially if he wasn't bisexual or an injection drug user.