Aircraft
      by Nation
      United States
      Army/Air Force (1924 - 1962)
      Liaison: Experience with
      Observation aircraft in the Louisiana maneuvers of 1941 indicated the need
      for smaller, lighter aircraft for liaison duties.  After World War
      II, liaison aircraft included light transport aircraft.  After 1962,
      liaison aircraft were re-designated either Observation or Utility
      aircraft.