Between World War II and the Vietnam wars, military bases of all services world wide had football teams. In the early 1960s, I was in Wiesbaden, Germany, as a liaison officer with German counterintelligence agencies. Occasionally, I would invite German officials to a unique experience: to see an American football game.
Remember that the "huddle" is a peculiar event not in any other game. On one occasion, about midway thru the first quarter, a German official, seeing his first game, commented to me (in German), "I don't quite see the need for all the frequent pauses for the secret planning sessions!"