The NATO alphabet assigns code words to the letters of the English alphabet acrophonically (Alpha for A, Bravo for B, etc.) 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, especially when the safety of navigation or person is essential.

SierraPapa is a simple program to help with learning the alphabet words. Apart from listing of the words, SierraPapa would help to master the alphabet by testing your memory. It can also be used for converting whole words or sentences into the alphabet words.