an aviator in the 110th observation squadron of the missouri national guard (1923–1943) became the most famous national guard pilot during the interwar period: captain charles a. lindbergh. his service illustrated the close ties between military and commercial aviation. trained to fly by the army, he joined the 110th observation squadron in november 1925. the following year, he became chief pilot for an airmail venture started by fellow 110th pilots major william robertson and his brother frank. after lindbergh made his historic solo trans-atlantic flight in may 1927, he recalled his service in the guard fondly.