Racing For The Sun by Amy Lane, Nick J. Russo
"I'll do anything." Staff Sergeant Jasper "Ace" Atchison takes one look at Private Sonny Daye and knows that every word on paper about him is pure, unadulterated bullshit. But Sonny is desperate, and although Ace isn't going to take him up on his offer of "anything", that doesn't mean he isn't tempted.
Instead, Ace takes Sonny under his wing, protecting him when they're in the service and making plans with him when they get out. Together, they're going to own a garage and build race cars and make their fortune hurtling faster than light across the desert. Together, they're going to rewrite the past, make Sonny Daye a whole and happy person, and put the ghosts in Ace's heart to rest.
But not even Sonny can build a car fast enough to escape the ghosts of the past. When Sonny's ghosts drive them down and run their plans off the road, Ace finds out exactly what he's made of. Maybe Sonny was the one to promise Ace anything, but there is nothing under the sun Ace won't do to keep Sonny safe from harm.