"Uh-" Billy flushed, not really used to being called on his self depreciating humor. "I dunno ... habit, I guess? Didn't really grow up with a whole lot of friends?"

Billy could tell names were a big deal for the Soldier, and he gave a bit of a sad smile, clearly wanting to be able to call him by one too. "I'll answer to whatever as long as you say it nice enough," he teased with a faint shrug, "Tommy's big into nicknames, it doesn't really bother me."