Sgt. Juan Fernandez and Gunnery Sgt. David Dignan, explosive ordnance disposal technicians, answer questions regarding unexploded ordnance at Joshua Tree National Park Headquarters, July 23, 2015. (Official Marine Corps photo by Lance Cpl. Connor Hancock/Released) - Sgt. Juan Fernandez and Gunnery Sgt. David Dignan, explosive ordnance disposal technicians, answer questions regarding unexploded ordnance at Joshua Tree National Park Headquarters, July 23, 2015. (Official Marine Corps photo by Lance Cpl. Connor Hancock/Released)