He snorts, though it's completely devoid of humor. No, Spencer doesn't seem like he's the fighting type, or ever was. Whereas Frank looks like he was made for war, all hard edges and brute force. "The beginning was the Marines." That's always been the beginning. He can pretend to be obtuse all he wants, but at least some things are still simple. "And I fucking loved--being a Marine." Nothing else compared to that brotherhood. To serving his country putting his inherent darkness to good use at last. The Marines offered him a safe harbor where he could be completely himself. He's never had that anywhere else, except maybe with Micro. When they were putting down the very people he thought he could trust.