Pretty obvious.

Tear off the bottom half of the page and the TDC will find all the necessary information on the remaining top half.

They unfold it out of sheer nosiness. I wonder what the response would be if what's on the other side of the paper were something mildly offensive? Graphic images? A note saying "If you are a TDC reading this, why? You have just failed another 'Red Team" test' - signed OIG"