 By the time No. 5 OTU relocated to Tocumwal , New South Wales , on 20 October 1943 , it had begun running courses on Douglas Bostons . Its first de Havilland Mosquito arrived the following month . As of April 1944 , the unit had a complement of sixty @-@ three aircraft , including five Mosquitos . It ran conversion courses for experienced pilots and navigators , as well as training courses for newer aircrew . No. 4 Operational Training Unit disbanded at Williamtown , New South Wales , on 30 April 1944 ; a small detachment remained to hand the base over to an advance party from No. 5 OTU the following day . The rest of No. 5 OTU transferred to Williamtown during July . The unit commenced photo reconnaissance courses in August , and by October its strength was over 1 @,@ 000 personnel . Mosquito fighter ace Charles Scherf briefly served as chief flying instructor in late 1944 . November was marred by four fatal accidents in the space of three days . 
