Data recites: "The RAF, or Royal Air Force was founded in 1918 by the amalgamation of the Royal Flying Corps and the Royal Naval Air Service. It was the first air force to be independent of army or navy control. They were noted for thwarting Hitler's plan for invasion of the United Kingdom during the Battle of Britain in 1940. They, along with the United States, formed the core of the UEAF, United Earth Air Force, formed in 2103."
Data peers at Jack's wrist. "Intriguing. A portable device. I have never seen one so small." He nods. "I see. You have traveled in time as well. May I inquire as to your means of transportation Captain? And I take it from your comments that you are not in the correct universe?"
*nods* I can't imagine him in anything else. And why Data knows all that stuff and doesn't know about the uniforms is beyond me. Maybe that file got deleted. ;)