Callback, the monthly safety bulletin from the people who run NASA’s aviation safety reporting system, was 25 years old in July. In its 300 issues to date, Callback has published hundreds of lessons-learned by pilots, controllers, mechanics and others who have filed more than 600,000 ASRS reports since the program started in 1979. In celebrating a quarter century of publishing, the ASRS team praised the late Capt. Rex Hardy, decorated U.S. naval aviator and corporate-aircraft test pilot, who created Callback.