Oh, good question. Strip 719 (3rd March 1981): The Colonel is dictating a letter to Beau, who has been summoned to the Colonel's office to do some secretarial work....
"Right, Peep, take this down. "Dear......" Oh, what's the name again? Don't prompt me! It's on the tip of my tongue! And do you, George Escargot, take this woman, Nancy -- THAT'S IT! NANCY!"
It's Nancy.