Is the acronym for Commander Amphibious Task
Force. This was the designation for the command
group overseeing the Allied invasion of Normandy on D-Day,
June 6, 1945
From the movie, "Saving Private Ryan": After landing on the
beach at Normandy, Capt John Miller is sending status reports through his radioman. When the soldier is killed, Miller takes the radio and shouts "
Cat F,
Cat F," trying to contact the Task Force command. He notices that the radio is out of commission and throws it away.