The first 77th Aero Squadron was formed at Kelly Field, San Antonio, Texas in August 1917, and commanded by Capt. H. L. Mumma. In September under the command of 1st Lt Kenneth M. Spence, the squadron’s designation was changed to Aero Construction Squadron. In November 1917 the 77th moved to Air Depot, Garden City, New York for deployment to the AEF. On December 4, 1917 the squadron moved to port of Embarkation Philadelphia and boarded the transport Northland. On the Northland were 9 Aero Squadrons with 70 officers and 1,339 enlisted men. These 9 Squadrons were the 10th, 12th, 13th, 16th, 19th, 75th, 76th, 77th and 101st. The Northland sailed with other transports, which were likely to be the transports USS George Washington and the USS Huron.