Being a vet, I can swear like, well literally, a sailor. But, I swear like a Joe, not an upperclass professional like the character I want to do the swearing in this instance. He doesn't swear often, but I want to have it happen now for emphasis because the guy he's talking to keeps flip-flopping in a high stakes situation. It's not an insult, just blowing off steam for a second. If this weren't a scifi, I would use "Jesus Christ." However, I want to keep the feel a little more distanced from our world.