Petty Officer 1st Class Matthew J. Cool (center), a Fleet Marine Force reconnaissance corpsman and Inspector-Instructor medical staff with 4th Force Reconnaissance Company, 4th Marine Division, Marine Forces Reserve, teaches reserve sailors methods of waterproofing gear during a FMF reconnaissance corpsman screening in San Antonio, April 19, 2016. The screening was hosted by 4th Reconnaissance Battalion, 4th Marine Division, Marine Forces Reserve, for Sailors across Marine Forces Reserve and the U.S. Navy Reserve to gain familiarity with the demands of the FMF reconnaissance corpsman pipeline. - Petty Officer 1st Class Matthew J. Cool (center), a Fleet Marine Force reconnaissance corpsman and Inspector-Instructor medical staff with 4th Force Reconnaissance Company, 4th Marine Division, Marine Forces Reserve, teaches reserve sailors methods of waterproofing gear during a FMF reconnaissance corpsman screening in San Antonio, April 19, 2016. The screening was hosted by 4th Reconnaissance Battalion, 4th Marine Division, Marine Forces Reserve, for Sailors across Marine Forces Reserve and the U.S. Navy Reserve to gain familiarity with the demands of the FMF reconnaissance corpsman pipeline.