The Cold War incident attracted international attention and introduced the world to high-altitude espionage. In 2018, I visited Beale Air Force Base ... into his U-2 helmet, ...

A joint U.S. Army and Air Force Reserve rescue mission in Washington ... Their CH-47F, chosen for its ability to hover at high altitude, has been specially configured for the mountainous terrain ...

Browse a gallery of the U.S. Air Force's high-altitude balloon experiments and the researchers, scientists, and test pilots who made them possible.

They don't call it the Mile High ... to the helmets, Denver's uniforms read "5280" on the inside collar of their jerseys. As part of their home-field advantage, the Broncos show "altitude sickness ...