SS you seemed to have missed the joke. However as we are on the topic 3 yrs . isn.t that long is it ?. Of course DEC,s shouldn,t be subjected to an interview to check their knowledge prior to a Command position , neither should anyone else , it,s all a bit "flying club " don,t you think ?.
Particularly when one considers the calibre and experience level of those doing the questioning , after all anyone can pick a few questions out of a book at random, what,s the point ?
All relevant knowledge should be examined by experienced trainers during the upgrade and or line training for DEC,s, and if found wanting then the candidate should be informed and a time limit set for improvement, this works very well in practice.