Army dude doesn't have to worry about getting his teeth punched out in the parking lot of a bar. By that standard, any out-of-the-closet gay man is more heroic.
Or, you know, both men deserve credit for doing their particular things.
Is Jason Collins revealing that he's gay brave? No. And that's why every gay professional athlete is open about their sexuality. Ever. Jason Collins is the only homosexual professional athlete to have existed.