Petty Officer 1st Class Dean Johnston, right, shows Joint Task Force-National Scout Jamboree commander Air Force Brig. Gen Robert Nolan crude oil samples in the Maritime Environmental Protection tent at the U.S. Coast Guard element of the Armed Forces Adventure Area during the 2010 National Scout Jamboree held here. Johnston, from Fredericksburg, Va., is also an Eagle Scout. The JTF’s goal is to provide professional military support and a safe and secure environment for Scouts and visitors during the event.