Sgt. Elizabeth Orrie, Defense Intelligence Agency, and her date, former Marine Alex Pereira, walk in the parade that began the Headquarters and Service Battalion Mardi Gras Masquerade Ball Jan. 29. - Sgt. Elizabeth Orrie, Defense Intelligence Agency, and her date, former Marine Alex Pereira, walk in the parade that began the Headquarters and Service Battalion Mardi Gras Masquerade Ball Jan. 29.