Senior Airman Jason Sweet, 306th Rescue Squadron pararescueman, briefs Airmen from the 355th Civil Engineer Squadron on the use of 9-line during a night training exercise at Davis-Monthan Air Force Base, Ariz., August 16. Nine-line is used to call in urgent evacuation for casualties from the battlefield. (U.S. Air Force photo by Airman 1st Class Michael Washburn/Released)
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