over London before the Prince of Wales on 25 April 1919, in concert with a parade by Australian soldiers. By 2:30 in the afternoon, he was taking his 50-strong aerial formation through a series of wild stunts over the alarmed Prince's head, and later told the story that he flew so close to the marching soldiers that their bayonets almost pierced his undercarriage. Cobby later said that this was: "probably the most foolish thing I have ever done". He returned to Australia in May 1919, and married Hilda Maude Urban in Caulfield, Victoria, on 24 April 1920; the couple had a son and a daughter. Following the disbandment of the AFC, Cobby joined the newly formed Royal Australian Air Force in 1921. Ranked flying officer (honorary flight lieutenant), he was one of the original 21 officers on the air force's strength at its formation that March. His first posting, along with most of his colleagues, was to a mixed squadron equipped primarily with S.E.5s and DH.9s at No. 1 Flying Training School, based at RAAF Point Cook. Flight Lieutenant Cobby became Commanding Officer (CO) of No. 1 Squadron when it was reformed at Point Cook on 1 July 1925, serving in the position until August 1926. By 1927, Cobby had been promoted to squadron leader, and the following year went to England to attend RAF Staff College, Andover. Returning to Australia, he took over as CO of No. 3 Squadron at RAAF Station Richmond, New South Wales, from Squadron Leader Frank Lukis on 13 January 1930. At this time, the position of No. 3 Squadron commander doubled as CO of the base. Though popular with his staff, Cobby was not known for his attention to detail. In December 1930, the Chief of the Air Staff, Air Commodore Richard Williams, arrived for an inspection and found the base to be in such a state of untidiness that he ordered every man on parade and gave them what was described as "an almighty dressing down", threatening that Christmas leave would be cancelled unless the place was cleaned up. Having handed over to Squadron Leader Bill Bostock on 22 November 1931, Cobby was promoted to wing commander on 1 May 1933 and subsequently served as RAAF Director of Intelligence. In this position he headed an interdepartmental committee that was formed in August 1933 to examine the possibilities of air survey and aerial photography