Does the 66 run on a Sunday?
Almost every military course I've ever been on starts first thing on a Monday morning. Trying to get to St Mawgan for a course starting at 0900 on Monday, in an era where air travel wasn't being authorized, meant leaving the north of Scotland on Saturday because of the train times. It was also only a 3 day course, so why couldn't it be held from Tuesday to Thursday (and yes, I did put that in the course critique, but needless to say nothing changed!!)