Petty Officer 2nd Class Michael Gerstel, Navy diver, a handler assigned to Marine Mammal Company of Explosive Ordnance Disposal Mobile Unit 1, rewards a bottlenose dolphin after a successful training evolution at Joint Expeditionary Base Little Creek-Fort Story during Frontier Sentinel 2010. An estimated 2,500 Canadian and U.S. military personnel and government civilian agencies are participating in the annual training exercise.