I cannot comment on OCS / SISPEC but I find that it is almost impossible for anyone to fail a vocational course in the SAF. There are people who get OOC because of injury but I have never heard of anyone failing due to sheer incompetence.
Is my observation correct or have anyone come across people who were so out of their element they actually got the boot?
While we are on this topic, is it true that the most CMI officers end up as RP or MTO?