The President of the United States of America, authorized by Act of Congress, July 2, 1926, takes pleasure in presenting a Second Bronze Oak Leaf Cluster in lieu of a Third Award of the Distinguished Flying Cross to Colonel William Humphrey Nelson (AFSN: FR-33458/AO-667540), United States Air Force, for extraordinary achievement while participating in aerial flight as an F-105 pilot over North Vietnam on 7 July 1966. On that date, Colonel Nelson was mission commander of a large force of fighter-bombers assigned to strike targets on Hanoi’s northeast rail line to Communist China. While en route to the target he discovered that the prevailing weather would preclude effective execution of the planned strikes. Drawing on his intimate knowledge of the lucrative targets within range of his strike force, Colonel Nelson directed his flight leaders to deliver their ordnance against key interdiction and fleeting targets along the Red River rail line. Colonel Nelson led his own flight in destroying a twenty-five car train and the tracks on which it stood despite intense defensive fire. The professional competence, aerial skill, and devotion to duty displayed by Colonel Nelson reflect great credit upon himself and the United States Air Force.