Granite is a trooper with sergeant's chevrons on his shoulder. He commands the Enclave Control Company which deals with perimeter defense. He doesn't fully believe in the Enclave's message as he can be convinced to aid the Chosen One.
When faced with the dilemma of believing the Chosen One's claim that the Oil Rig is set to explode, Granite can be convinced to aid the Chosen One against Frank Horrigan or provoked into combat. Otherwise, he and his squad stand idle.
"He's some genetically engineered freak is what he is. Used to be the president's bodyguard. Secret Service agent Frank Horrigan. Now he's more than half machine."
"He's going to mop the floor with you. He's tough, fast, and just plain mean. I've seen what he likes to do to mutants and it ain't pretty... I don't like to talk about it. It gives me nightmares. Let's just say that those walls aren't covered with *rust* exactly."
"Okay, okay. I can't talk for everyone, but my squad and I will do our best to help you put that freak Horrigan away for good. I don't wanna drown like no rat."
"Sergeant Granite of EC Company... Enclave Control Company. We're responsible for perimeter defense, *usually* that is."
"I'm tired of the killing."
"You make me laugh. Y'know, I think you might even last over the one-minute mark with Horrigan. That'd be a new record. Good luck, mutie."
Granite offhandedly states, "These are not the droids we are looking for." in one of his dialogue lines. This is an approximation of a line said by Imperial Stormtroopers in Star Wars Episode IV: A New Hope.
In response to a question about Granite and EC Company's continuity, Chris Avellone postulated, "He [Granite] and the EC crew hopped aboard the tanker, and escaped to the mainland after watching the fireworks from the top of the tanker, whispering "gawd-damn" to themselves and throwing suggestive glances at the women from Vault 13 and Arroyo. After reaching the mainland, they headed north to Navarro and were never heard from again, though their adventures could fill several eras worth of pulp comics."