Marines with 2nd Marine Logistics Group take off their protective suits after completing a field survey with the AN/PDR-77, a device that detects and measures radiation, during a training exercise aboard Camp Lejeune, N.C., Oct. 17, 2012. Chemical, biological, radiological and nuclear defense specialists instructed the troops on how to use the equipment to detect and measure simulated radiation in contaminated situations throughout a four-day course.