Krueger came to feel that the prospects for promotion in the infantry were very poor, and in 1927 he tried to transfer to the United States Army Air Corps. He attended the Air Corps Primary Flying School at Brooks Field, Texas, but suffered an attack of neuritis in his right arm, and his flight instructor, Lieutenant Claire Lee Chennault, failed him. In December 1927, he was offered a position as an instructor at the Naval War College, where he taught classes on World War I, and on joint operations.[18][19]