Jane Trefusis Forbes had been Chief Instructor,
Auxiliary Territorial Service School of Instruction in 1938. In 1936, Forbes,
Helen Gwynne-Vaughan and
Kitty Trenchard launched the Emergency Service, to train women and organise them to be prepared in case of war. There were probably fewer than 100 women in the organisation, which was not officially recognized. On 1 July 1939, three months before the beginning of the
Second World War, she was appointed as Director of the WAAF in order "to advise the Air Member for Personnell [sic] on questions concerning the WAAF". Trefusis Forbes inherited "The Observatory" in Pitlochry in 1936, upon the death of her uncle, the physicist
George Forbes. Early in the war she is said to have allowed the house to be used as a place for senior militarily personnel to have a few days respite – Field Marshal
Sir Bernard Montgomery is thought to have been among the guests. By 1943 there were 175,000 women in the ranks of the WAAF. In October 1943, she toured Canada to assess the Women's Division of the
Royal Canadian Air Force (RCAF). She also toured India to investigate the possibility of employing women in the
South East Asia Command. She retired in August 1944. ==Honours==