control tower operator

control tower

aerodrome control tower

conning tower

watchtower (watch tower)

strut tower

lighting tower

vertical access tower

watch tower

launching tower

artillery observation tower

secondary armament director tower

parachute tower

radio tower

air traffic control operator

operator control unit (OCU)

control post operator

vertical control operator

fire-control operator

dual operator control

aircraft control and warning operator

early warning system (EWS) operator

identification operator

operator maintenance

operator’s pack

operator's permit

ship operator

telephone operator

radio telephone operator (RTO)

aiming rule operator

azimuth (deflection) display board operator

navigator-radio operator

air operator certificate