Charity Ludwig, U.S. Air Force Office of Special Investigations analyst, records pieces of evidence found by students in a Post Blast Training Course at Ramstein Air Base, Germany, Aug. 10, 2023. The week-long course is conducted by the Bureau of Alcohol, Tobacco, Firearms and Explosives to train students in explosives identification, the effects of explosions, how to recognize improvised explosive devices, and how to collect evidence from explosions. (U.S. Air Force photo by Airman Trevor Calvert)