Why would my security clearance not still be valid; it says it’s good for 10 years?
The agency that sponsored your certificate or the department who granted the certificate may, without your consent or knowledge, rightfully terminate the Clearance if they no longer need it to guarantee your security status after you leave their employment. It is valid until the expiration date only if in use. The renewal date refers to the information verified for your clearance to be granted and when more current information will be needed to renew your clearance.