From Halopedia, the Halo wiki
UNSC Marine Corps
Major Roland Huffman (Ret.) is a retired UNSC Marine Corps infantry sniper. He served from 2548 to 2573.
He was a Marine infantry sniper who had some experience with Brute equipment. Apparently he was a long time friend of Marine Tomas Navarro.
He was later interviewed in a documentary regarding his role in the marines and enemy equipment, the Type-25 Spiker in particular, in the Museum of Humanity.