TOPSECRET
| Date | Clue |
|---|---|
| 2021-04-15 | On a need-to-know basis |
| 2020-08-14 | Upper-level security clearance status |
| 2017-01-16 | Highly classified |
| 2016-10-24 | Highly classified |
| 2015-02-21 | Phrase often stamped in red |
| 2013-11-08 | Classified |
| 2006-06-03 | Known to next to none |
| 1998-03-18 | Hush-hush |
| 1996-09-21 | Like the Manhattan Project |