Electronics technician (United States Navy)
The United States Navy job rating of electronics technician (ET) is a designation given by the Bureau of Naval Personnel (BUPERS) to enlisted members who satisfactorily complete initial Electronics Technician "A" school training. == History of the Electronics Technician rating == === WWII era === The Electronics Technician (abbreviated as ET) rating was originally established as Radio Technician (abbreviated as RT) in April 1942 during the height of World War II. The story of their training may be found at "Solving the Naval Radar Crisis" by Raymond C Watson, Jr.
Source: Wikipedia — Electronics technician (United States Navy) (CC BY-SA 4.0)