Sean Masters
From Star Trek : Freedom's Wiki
Marine CO - Major Sean Masters - 3/4th Human, 1/4th Vulcan, he is the son of Vice Admiral Sullivan and Starfleet Pilot Commander Doug Masters. He’s a Starfleet brat, moving from posting to posting throughout his childhood. His Father was killed in the line of duty fighting a skirmish battle that didn’t even have a name, just a number. His mother unable to care for him by herself, in a way she felt adequate, sent him to boarding school on Vulcan. On graduation he joined the Marine Corps.