any field in the AEF. The squadron remained at Issoudun until after the Armistice with Germany in November 1918, then returned to the United States in March 1919. Arrived at Mitchel Field where the squadron members were demobilized and returned to civilian life. Intra-war period After the war the squadron was reorganized in 1925 as the Michigan National Guard's first flying unit, the squadron consisted of 20 officers and 90 enlisted men meeting weekly in a Detroit garage. It received Federal recognition in May 1926 as the air section of the Michigan National Guard's 32d Division. Its primary mission was artillery spotting and observation of troop movements. In March 1938, elements of the 107th Observation Squadron performed gunnery training at Eglin Field, Florida, for 15 days, deploying from Wayne County Airport at Detroit, Michigan. 23 officers and 111 men arrived on 1 March. One detachment flew in eight aircraft while the rest arrived by rail over the Louisville and Nashville Railroad at Crestview, Florida. World War II Called to active duty with Douglas O-38 and North American O-47 observation planes on 15 October 1940, the 107th was sent to DeRidder Army Air Base, Louisiana for unit training on 28 October 1940. For many years this airfield was simply called the Artillery Range Airport Camp. On 11 April 1941, Lieutenant Wilmer Esler was killed in the crash of his O-47 when it experienced an engine failure on takeoff. The War Department announced on 19 June 1941 that the Air Corps field at Camp Beauregard would be named Esler Field in honor of his sacrifice. In 1941, the 107th was joined by two other National Guard observation units to form the 67th Observation Group. The 67th Group did anti-submarine patrolling off the East Coast of the US from mid-December 1941 to March 1942, when it returned to Louisiana for training in fighter aircraft. The 67th Group was sent to RAF Membury, England, in August 1942 and flew Supermarine Spitfire Mk. Vs and De Havilland Tiger Moths for a year until equipped with North American F-6 Mustangs. Pre-invasion missions began in December 1943. For successful photo missions of the French invasion coastline without loss of a single aircraft, the 107th was awarded the Presidential Unit Citation on 7 April 1945. The 67th Group advance detachments landed in Normandy 13 days after D-Day. The Belgian Fourragere was awarded for conspicuous action during the Battle