The Navy, as well as all other branches of the US military, currently use the ICAO (International Civil Aviation Organization) alphabet for radio communication. This alphabet was adopted by the US armed services in 1956, and is currently used by NATO countries as well as civil aviation around the world.
The chart below shows both the code words for each letter and their recommended pronunciation.
|I||India||IN dee ah|
|J||Juliet||JEW lee ett|
|N||November||NOH vem ber|
|R||Romeo||ROW me oh|
|S||Sierra||see AIR ah|
|U||Uniform||YOU nee form|
During World War 2, the US developed one phonetic alphabet for use by both the Army and Navy to simply inter-branch communication. This Army/Navy Alphabet was used until 1956, when it was replaced by the ICAO/NATO alphabet and although outdated, is still used by many who were in the US military at that time.