"Tisdale's" tour of duty in Hogan ended on June 11, 1920 when he reported to the Naval Academy for post graduate studies in engineering. A year later, he checked in at the New York Navy Yard for practical instruction during the summer, before entering Columbia University on September 28 for further course work which lasted until the early summer of 1922, when he moved to the General Electric Co. in Schenectady, New York, until the end of July. Tisdale rounded out his scholastic efforts late that summer with six weeks of study at the Westinghouse Electric and Manufacturing Co., at Pittsburgh, Pennsylvania.