Ultra: An intelligence project led by British codebreakers at Bletchley Park that successfully decrypted Enigma-encoded messages during World War II, providing crucial information to the Allies.
Navajo Code Talkers: Native American soldiers who used their native language to transmit coded messages that were extremely difficult for enemies to decipher during World War II.
SIGINT: An abbreviation for Signals Intelligence, which refers to the interception and analysis of enemy communications in order to gain strategic advantage.