27 July 1911. Eugene Ely, a private in the California National Guard Aeronautical Detachment of its 7th Coast Artillery Company and a pioneering civilian aviator, was commissioned.
15 July 1915. The Nebraska National Guard organized a small "Aviation Corps."
13 July 1916. The First Aero Company, New York National Guard, was mobilized during the border crisis with Mexico precipitated by Pancho Villa's raid on Columbus, New Mexico. This was the first time that a Guard aviation unit was called into federal service. It trained at Mineola, New York but did not deploy to the Mexican border.
July 1921. Maryland's 104th Squadron received several of its allotted 13 Curtiss JN-4Ds, becoming the first postwar National Guard aviation unit to obtain planes from the Army Air Service.
July 1922. Maryland's 104th Squadron became the first postwar National Guard flying unit to participate in an annual summer training encampment. The training was conducted at Langley Field, Virginia.
6 July 1925. The 116th Observation Squadron, Washington state National Guard, hired its first six full-time "caretaker" personnel under the authority of the National Defense Act of 1916. They maintained the unit's airfield and equipment between drills as well as when the unit was not conducting its annual training encampment.