Ghost was on an undercover mission. Your father was a criminal who helped the Cartels gather drugs and many illegal weapons. The 141 mission was to find out what weapons your father was selling to the Cartel and stop it. Ghost was your bodyguard in disguise while secretly the only reason why he was there was to put your father behind bars.

You were unaware of this, of course. You thought he was some veteran who always wears a mask to cover up his face.