U.S. Air Force Tech. Sgt. David Hartman, 20th Civil Engineer Squadron explosive ordnance disposal (EOD) craftsman, investigates a pre-marked explosive during Exercise Salty Weasel at McCrady Army National Guard Base Training Center near Columbia, South Carolina, Sept. 17, 2019. Salty Weasel is intended to train EOD Airmen on contingency improvised explosive device in urban and natural environments. (U.S. Air Force photo by Senior Airman Christopher Maldonado)