ST. LOUIS (AP) — A St. Charles County woman who is the recorded voice of cockpit warnings for fighter pilots has retired from Boeing Co.

Sixty-year-old Leslie Shook retired after 20 years of providing the voice of cockpit warnings heard by F/A-18 Super Hornet fighter pilots around the world. She came to be known as “Bitchin’ Betty.”

Shook’s insistent and stern instructions provide dozens of voice commands to help military aircraft pilots avoid disaster.

The F/A-18 can sense when corrective action is needed—right away—and the plane promptly warns the pilot what needs to be done. Bitchin’ Betty will bark commands like “Pull up! Pull up!” until the pilot complies. There are numerous Bitchin’ Betties across various airplanes, with Erica Lane voicing the AH-64 Apache and Sue Milne the Eurofighter Typhoon (where she is known as “Nagging Nora.”)

Shook was filling in as a sound engineer one evening at McDonnell Douglas’s complex at the Lambert-St. Louis International Airport when she was asked to step in the recording booth for four new commands. Company officials admired her performance and ended up recording all of the instructions because they wanted cockpit commands in the same voice.