Private M. Romero was one of the MACOs assigned to Enterprise during the Xindi mission and served aboard Enterprise in 2154. On February 13, 2154, Lieutenant Malcolm Reed asked the MACOs for volunteers to join the mission to board the Xindi weapon. All the MACOs volunteered, so Reed chose Romero, M. Forbes and W. Woods. Romero was fortunate enough to survive. (ENT: "Countdown", "Zero Hour") Romero was among the MACO's who accompanied Captain Archer to Cold Station 12 and survived the Augment attack. (ENT: "The Augments")