Secret Clearance
Secret is the middle level of security clearance granted by the U.S. government, between Confidential and Top Secret.
Quick Facts
| Level | Middle standard clearance |
| Damage if disclosed | Serious damage to national security |
| Investigation | Tier 3 (formerly NACLC) |
| Reinvestigation | Every 10 years / Continuous Evaluation |
| Typical timeline | 2-6 months |
What It Means
A Secret clearance allows access to information that, if disclosed without authorization, could reasonably be expected to cause serious damage to national security[1]. This includes military plans, weapons systems details, and sensitive intelligence reports that don't rise to the Top Secret level.
Investigation Requirements
Secret clearances require a Tier 3 background investigation, which includes[2]:
- National agency database checks (FBI, CIA, etc.)
- Credit history review
- Criminal records check
- Citizenship and identity verification
- Employment and education verification
- Review of the SF-86 questionnaire responses
Unlike Top Secret investigations, Tier 3 investigations typically do not include in-person interviews with references unless issues arise.
Processing Times
According to DCSA metrics, the average processing time for Secret clearances is significantly shorter than Top Secret[3]. However, individual timelines vary based on the complexity of your background.
Common Positions
Secret clearances are the most commonly held clearance level. They're required for:
- Most military service members
- Defense contractor employees
- Government employees handling sensitive but not highly classified data
- IT administrators at cleared facilities
- Many engineering and technical roles
Related
- Confidential Clearance
- Top Secret (TS)
- NACLC
- Tier 3 / Tier 5 Investigations
- Clearance Levels Explained
References
- ^ Executive Order 13526: Classified National Security Information. National Archives. Accessed 2026-01-08.
- ^ Security Clearance Process: Answers to Frequently Asked Questions. Congressional Research Service. Accessed 2026-01-10.
- ^ DCSA Personnel Vetting Processing Times. Defense Counterintelligence and Security Agency. Accessed 2026-01-08.