Petty Officer 3rd Class Robert N. Winecoff, of Smyrna, Tenn., (left), a student at the Coast Guard's Aviation Technical Training Center, inspects the tail rotor drive shaft on an MH-65 helicopter with fellow aviation maintenance technician Petty Officer 3rd Class Danny S. Gonzalez, of Tampa, Fla., March 18, 2014. Students in the four-week Aviation Maintenance Technician MH-65 Airframe & Powertrain course learn the necessary skills, knowledge and practical experience required to service, maintain and repair airframe and powertrain systems and associated equipment on the MH-65 Dolphin helicopter. AMTs in the Coast Guard may fill a variety of aircrew positions including flight engineer, flight mechanic, loadmaster, dropmaster, sensor-systems operator or basic aircrewman.