[Bill Walker]

I have seen him identified as civilian in other documents. It was quite common for Navigation and Observer Schools to employ civilian pilots. They were known as "staff pilots", and were just drivers, not instructors. The instructor would have been an RCAF member, sitting in the back with the student observers. It was also quite common for these staff pilots to be non-Canadian (quite a few were American). They were usually hired because of their previous flying experience. They would be graded at one of the Composite Training Squadrons, and then given a quick conversion course to type at the School.