Major J. Hayes was a Human male who served as a Military Assault Command Operations officer during the mid-22nd century. In 2153, Hayes was assigned as the commanding officer of the MACO detachment aboard Enterprise NX-01 for the mission into the Delphic Expanse. Hayes died in February of 2154, from injuries sustained rescuing Ensign Hoshi Sato from the Xindi-Reptilians aboard one of their warships.
Hayes was a hardened military man with extreme discipline. He was dedicated to the chain of command, and preferred to maintain a certain level of consistency in his life. Hayes was a graduate of the military academy at West Point, New York, and had undergone lunar survival training, an extremely intense ordeal, by the time he served on Enterprise. (ENT: "Harbinger", "Hatchery")
Almost immediately upon boarding Enterprise, Major Hayes found himself in conflict with chief armory officer Malcolm Reed, who believed that Hayes intended to take control of the ship's security. When Enterprise's first officer, T'Pol, recommended that Reed allow Hayes to lead a rescue mission for Captain Archer and Commander Tucker, who were being held captive in a trellium mining facility, Reed voiced his opinion that Hayes thought that his own team was more capable of carrying out the mission. (ENT: "The Xindi")
In February 2154, Hayes led a boarding party aboard a Xindi-Reptilian warship to rescue Hoshi Sato, who had been abducted by the Reptilians. While the rescue mission was ultimately successful, and Sato was safely retrieved, Hayes was shot through the chest by a Xindi particle weapon mid-transport, suffering serious injuries. In Enterprise's sickbay, Hayes recommended that Reed should rely on Corporal McKenzie and make use of her familiarity with the MACO team upon his death. Immediately thereafter, Hayes lost consciousness and, despite attempts by Dr. Phlox to revive him with cardio-stimulators, Hayes succumbed to his injuries and died. (ENT: "Countdown")
