I think you totally could. The right wig, and some shadows on your jaw to sharpen it... and there you go. All things considered, being blond yourself saves you a lot of hassle with the eyebrows. There's some makeup tutorials on Youtube that show how to de-feminize yourself.
This should do the trick.
But really, I wouldn't sweat the small stuff, just make sure you look sufficiently manly and the clothes/wig/persona do the rest for you.
Of course, I'm not a veteran. LOL