Briefing FBI bomb technician Ian Bruce Vabnick, center, who has a doctoral degree in physics, gives a field lecture to explosive ordnance disposal units from the Air Force, Army, and Marine Corps during the Raven’s Challenge exercise at Camp Pendleton, Calif., Aug. 3, 2017. The exercise is funded by the Army and led by the Bureau of Alcohol, Tobacco, Firearms, and Explosives with participants from federal, state and local law enforcement agencies. DoD photo by EJ Hersom SHARE: Download: Full Size (1.39 MB) Tags: raven’s challenge eod, air force, training, marine corps, airmen Credit: EJ Hersom VIRIN: 170803-D-DB155-002A.JPG Photo Gallery