Ron Heflin, a transportation security specialist and explosives expert with the Transportation Security Administration, leads a group in training at Marine Corps Base Hawaii’s post office, Nov. 15, 2013. More than 20 representatives from various locations including Joint Base Pearl Harbor-Hickam, Fort Shafter and U.S. Pacific Command came to the post office to receive postal screening training with the base’s postal Marines. (U.S. Marine Corps photo by Kristen Wong)