 The 109th AS is the oldest unit in the Minnesota Air National Guard, having over 90 years of service to the state and nation.It is a descendant organization of the World War I 109th Aero Squadron, established on 27 August 1917.It was reformed on 17 January 1921, as the 109th Observation Squadron, being the first of 29 National Guard aviation squadrons to receive federal recognition following World War I.