What you lost at your ending debrief was your accesses.
Most likely you got to sign non-disclosure documents listing the severe penalties for violations. Depending on your accesses you might also have had to sign publishing restrictions and/or travel restrictions.
The clearance is revoked when you leave your job. You are talking about the 10 year or 5 year review period a clearence investigation allows reinsurance without another full vetting.
If Trump, Coats, etc. yanks Brennan’s security clearance, can he get the same info from his buddies in Five Eyes?