World War II

After receiving his pilot wings, he was assigned as an instructor pilot with the Army Air Forces Training Command from 1942 to 1943. After completing his training in the North American P-51 Mustang, he was deployed as a P-51 pilot with 357th Fighter Squadron of the 355th Fighter Group in RAF Steeple Morden in England, in May 1944. Flying missions in the European theater of World War II, he was credited with his first aerial victory, when he shot a Messerschmitt Bf 109 north of Magdeburg, Germany on June 21, 1944. On June 24, he received his first Distinguished Flying Cross, when he led a flight of P-51s to attack a German airfield in east of Angers, France, where he destroyed three aircraft on the ground and other vital ground targets.^[1][3][4]

On July 7, 1944, Haviland shot down two Messerschmitt Bf 110s, while en route to Halle, Germany and on August 3, he shot down another Fw 190, his fourth aerial victory. On September 12, he led the 357th FS in attacking a German airfield in Brüx, Czechoslovakia, where he personally destroyed three enemy aircraft on the ground. He finally became a flying ace on November 26, 1944, when he shot down a Fw 190 and Bf 109, while defending 2nd Air Division's B-24 Liberator bombers over Hanover and Gardelegen from German aerial attacks, which were also his last aerial victories of the war.^[3][1]

In February 1945, he was transferred to the 65th Fighter Wing, before returning to the United States on the same month. Following the end of World War II, he left active duty on August 31, 1945.^[1][2]

During World War II, Haviland was credited with the destruction of 6 enemy aircraft in aerial combat plus 2 damaged, and 6 destroyed plus 3 damaged on the ground while strafing enemy airfields. While serving with the 355th FG, he flew P-51s bearing the name "Barbara".^[1]