Justo Orozco was a Sergeant with the USMC Eleventh Marine Expeditionary Unit.
It is unclear if this character has any connection to the Costa Rican pastor, lawyer, mathematician and politician of the same name.
On Judgment Day, Orozco and his men are conducting a drug-interdiction exercise with the Mexican Army in Baja California. It is here they witness the rise of Skynet - they suddenly see the opening shots of the War Against The Machines when Skynet's nuclear missiles hit the nearby cities of San Diego, Twentynine Palms and Hermosillo. Following the attack, Orozco takes the lead and assures the men "We'll be all right. We'll survive, because we're Marines, and that's what Marines do."