 Complete the following phrase:  After being formed in June 1942, under the command of Squadron Leader A. Crighton, No. 15 Squadron was sent to Tonga later that year where it began operating the P-40 Kittyhawk. It deployed to Kukum Field on Guadalcanal in April 1943, under the command of Squadron Leader Michael Herrick. In October 1943, the squadron formed part of a New Zealand fighter wing along with No. 18 Squadron RNZAF; in November 1943 the wing flew over 1,000 sorties in support of operations on Bougainville Island, beginning with the 