In voice procedures 'Roger' means 'GUM' (got your message) in both military- and civilian aviation radio communications. This usage comes from the initial R of received: R was called Roger in then-current radio alphabets such as the Joint Army/Navy Phonetic Alphabet. It is commonly followed by the word that to form 'Roger That'. It is also often shortened in writing to 'rgr'. R is Romeo in the modern NATO phonetic alphabet; the updated phrases now in use are for example 'I'll Romeo that' or 'Romeo and Out'.