PS I know I shouldn't have to tell you this but ABSOLUTELY DO NOT LIE even if knowingly lie by ommision on the security paperwork! Had a guy get his clearance suspended temporarily because he lied about using cocaine a few times in college! It was no biggie but the investigators had interviewed 3 of the personal references he listed. What he wasn't prepared for was that the investigators "cultivated" 3 ADDITIONAL references from those folks...people he didn't list on his paperwork. You guessed it, the 3 friends he listed were "coached" by him but since he didn't know about the other 3...well they pretty much confirmed what had already been said but they also gave up the partying and drug use information.

He eventually got his clearance back but for a while there he wasn't sure if he would. He had to work on some BS busywork in the interim. If his clearance got revoked he would have been dismissed in the blink of an eye!