Osborne was a United States Air Force serviceman stationed at Lower Heyford Air Force Base in the UK during Day 9. After President Heller decided to hand over Lieutenant Chris Tanner, a drone pilot who was supposedly responsible for the attack on Major Shepherd's convoy which killed two American and two British soldiers, to the Royal Military Police, airmen led by Captain Greg Denovo escorted Tanner for a military transport. Osborne stood guard while his fellow servicemen including Harris, Ramirez, Weston and Wilson to the back of a military vehicle, leaving for the U.S. Embassy for further interrogation.