Petty Officer 1st Class Mark Petre (center), instructor at Aviation Technical Training Center in Elizabeth City, N.C., (center) offers instruction to Petty Officers 3rd Class Justin Mahaffey and Jentzen Green, both students and aviation maintenance technicians, during an AMT H-65 "C" school class at ATTC Nov. 18, 2014. Student AMTs became familiar with the MH-65 Dolphin helicopter's Turbomeca engine during the class. (U.S. Coast Guard photo by Petty Officer 3rd Class Nate Littlejohn)