Issued: 5-Jan-1945, Canada Gazette
"Since the outbreak of hostilities, Electrical Commander Johnstone, MBE, has given devoted and loyal service to the Royal Canadian Navy. His work as a Scientist has been outstandingly successful. As a Director of Operational Research since July 1943, Electrical Commander Johnstone, MBE, RCNVR, has built up a sound organization, and through his energy and perspicacity, he has contributed material which has been of great operational value and has definitely increased the efficiency of the prosecution by the Royal Canadian Navy of anti-submarine warfare."