Most of the ex airforce guys I fly with are excellent. However, there are one or two bad apples who were so used to being in charge and not being questioned by their juniors that a dangerous lack of CRM prevails in their cockpits.
Like some Atlantic Barons and others who said 'gear up and shut up, and where's my coffee?', these pillocks think they are infallible sky gods and they will not accept criticism. Some of them were single fast jet pilots and did not operate with a crew before flying commercially. They don't think there is anything wrong with the way they conduct flights and think the CRM course is for everyone else junior to them.
As far as passing a CRM course, we have no exam. We just sign an attendance sheet.