A vintage B-25 Mitchell bomber flies near the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base, Ohio, April 18, 2010, during a memorial flight honoring the Doolittle Raiders. A similar B-25 Mitchel flew over the Yale-Columbia game in New Haven, Connecticut, on November 2, 2013 in honor of military aviation pioneer Gen. Henry "Hap" Arnold. (U.S. Air Force photo/Tech. Sgt. Jacob N. Bailey)