 They are also eligible for promotion to senior flag rank positions, including command of aircraft carrier strike groups, expeditionary strike groups, joint task forces, numbered fleets, naval component commands and unified combatant commands.A small number of US Navy NFOs have later opted for a lateral transfer to the restricted line (RL) as aeronautical engineering duty officers (AEDO), while continuing to retain their NFO designation and active flight status.Such officers are typically graduates of the U.S.