MLA standing for Movement Control Check Point.
It usually equals several hours of being buggered about by them nasty clerks.
Whenever you have to sign for something (ID Discs, Medical Thingy, passport etc. etc.) always remember to ask them what date it is. It cheers them up no end. They never tire of hearing that question, even if it is over 100 times in a day, and you've been warned that you'll get covered in highlighter pen if you ask them.
Oh, and to add to their joy, wash your passport 2 days before deployment and lose your ID Discs.