Bradley served in the Korean War as Chief Nurse for the 171st Evacuation Hospital. In November 1950, during the Chinese counter-offensive, she refused to leave until she had loaded the sick and wounded onto a plane in Pyongyang while surrounded by 100,000 advancing Chinese soldiers. She was able to jump aboard the plane just as her ambulance exploded from an enemy shell. In 1951, she was named Chief Nurse for the Eighth Army, where she supervised over 500 Army nurses throughout Korea.