Antes del alfabeto fonético conjunto cada rama de las Fuerzas Armadas usaba uno propio, haciendo que fuesen más difíciles las comunicaciones entre ambas. El alfabeto fonético conjunto Ejército/Armada es el siguiente: (es) El alfabeto fonético conjunto Ejército/Armada (en inglés Joint Army/Navy Phonetic Alphabet) fue un alfabeto fonético desarrollado en 1941 y que fue usado por todas las ramas de las Fuerzas Armadas de los Estados Unidos hasta que fue reemplazado por el alfabeto fonético de la OTAN en 1956.

* intra-within a service (but not between services) of one nation Thus, the Combined Communications Board (CCB), created in 1941, derived a spelling alphabet that was mandated for use when any US military branch was communicating with any British military branch when operating without any British forces, the Joint Army/Navy spelling alphabet was mandated for use whenever the US Army and US Navy were communicating in joint operations if the US Army was operating on its own, it would use its own spelling alphabet, in which some of the letters were identical to the other spelling alphabets and some completely different. * joint-between (but not necessarily within) two or more services of one nation * combined-between services of one nation and those of another nation, but not necessarily within or between the services of the individual nations A summary of the terms used was published in a post-WWII NATO memo: During WWII, the Allies had defined terminology to describe the scope of communications procedures among different services and nations. The last WWII spelling alphabet continued to be used through the Korean War, being replaced in 1956 as a result of both countries adopting the ICAO/ITU Radiotelephony Spelling Alphabet, with the NATO members calling their usage the 'NATO Phonetic Alphabet'. For communication between the different countries and different services specific alphabets were mandated. The Allied militaries – primarily the US and the UK – had their own radiotelephone spelling alphabets which had origins back to World War I and had evolved separately in the different services in the two countries. they are not a system for transcribing speech sounds. They are not a 'phonetic alphabet' in the sense in which that term is used in phonetics, i.e.

The Allied military phonetic spelling alphabets prescribed the words that are used to represent each letter of the alphabet, when spelling other words out loud, letter-by-letter, and how the spelling words should be pronounced for use by the Allies of World War II.

U.s. army wwii spelling alphabet