Especially after a hard day of shooting down Nazis. This, by the way, is a Czech pilot, after landing on Sept. 7, 1940, around the height of the Battle of Britain.
More on war dogs here.
Photo credit: Wikimedia Commons
Thomas E. Ricks covered the U.S. military from 1991 to 2008 for the Wall Street Journal and then the Washington Post. He can be reached at firstname.lastname@example.org.