More on the IRSA/ICAO Spelling Alphabet from Wikipedia:
The ICAO spelling alphabet assigns code words to the letters of the English alphabet acrophonically so that critical combinations of letters can be pronounced and understood by those who transmit and receive voice messages by radio or telephone regardless of their native language. The paramount reason is to ensure intelligibility of voice signals over radio links.
After the (IRSA) alphabet was developed by the International Civil Aviation Organization (ICAO) [and implemented by ICAO March 1956] it was adopted by many other international and national organizations, including the North Atlantic Treaty Organization (NATO), the International Telecommunication Union (ITU), the International Maritime Organization (IMO), the American Federal Aviation Administration (FAA), the American National Standards Institute (ANSI), and the American Radio Relay League (ARRL).
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