action officer action officer /ˈækʃən ˈɒfɪsər/

noun

1. The case officer designated to perform an act during a clandestine operation (especially in a hostile area)  ( action officer )
   the case officer designated to perform an act during a clandestine operation (especially in a hostile area)
    The action officer is responsible for executing crucial tasks during the mission.
   The action officer is responsible for executing crucial tasks during the mission.