Actor Charlton Heston once held a "Q" Clearance for six years when he served as a nuclear armament topics training film narrator for the military during his post-World War II military service years.
Q clearance | Minimum obstacle clearance altitude | High Tech Gays v. Defense Industrial Security Clearance Office | Broadcast Advertising Clearance Centre |
For example, an individual cleared for Department of Defense Top Secret had to undergo another investigation before being granted a Department of Energy Q clearance.