The process would be to get into the Delorean, make sure the flux capacitor is working and then type any date between 1995 and 2005 into the computer. Lower the accelerator and then reach 88mph. This will take you back to a time where you got a letter of displeasure/bust and then told to soldier on. Unfortunately, now it's 2011 and the Army doesn't need soldiers, it seems a transfer to 1(UK) Civ Div is the only option for a those failing a CDT.
Speak to you CoC at work tomorrow though, I'm sure they have the answers.