A cloud of heat and smoke erupts from the wreckage after a 1,500 pound explosive detonated, Sept. 27, on the Eglin Air Force Base range. The controlled explosion was to set a scene for the FBI's large vehicle bomb post-blast school this week. State and county law enforcement, along with Navy and Air Force explosive ordnance disposal technicians, learned the proper procedures to investigate and maintain a large scale vehicle explosion. The week-long course was the second held on Eglin with 67 students representing 18 different U.S. agencies.