May 31, 1967

Two Air Force crews flying Sikorsky HH-3E Jolly Green Giants make the first nonstop flight across the Atlantic by helicopter. The 4,271-mile flight takes 30 hours and 46 minutes, and requires nine inflight refuelings. Maj. Herb Zehnder, one of the pilots on this flight, would fly the exact same HH-3E three years later as part of the daring attempt to rescue American servicemen from the Son Tay prisoner of war camp in North Vietnam.