query: Do people in the military learn Morse code?
passage: Morse code
Beginning in the 1930s, both civilian and military pilots were required to be able to use Morse code, both for use with early communications systems and for identification of navigational beacons which transmitted continuous two- or three-letter identifiers in Morse code. Aeronautical charts show the identifier of each navigational aid next to its location on the map.
passage: United States military occupation code
Warrant officers and officers received the same career field codes as enlisted and NCO personnel and ended in the same SQI letter codes. Warrant officers received a five-symbol MOS consisting of a four-symbol field specialty code consisting of the two-digit field code, a one-digit sub-field code number (usually "0"), the field specialty code letter, and followed by the SQI code letter. Officers now had a four-symbol alphanumeric MOS. It consisted of the three-symbol field specialty code of two numbers and a specialty code letter and ended in the SQI letter code.