Electronics Technician (ET):

ETs are responsible for electronic equipment used to send and receive messages, detect enemy planes and ships, and determine target distances. They must maintain, repair, calibrate, tune and adjust all electronic equipment used for communications, detection and tracking, recognition and identification, navigation and electronic countermeasures.

 

ET  Electronics Technician (1948-

 

ETN  Electronics Technician Communications
ETN  Electronics Technician Navigation (Ballistic Missile Submarine to c1980)
ETR  Electronics Technician Radar
ETS  Electronics Technician Sonar