My secret security clearance expired, but I still have 1-2 years on my contract. What will happen if I don't get approved for new clearance?

How did you let your clearance expire? Ignored the email that was sent awhile ago? Where was your security manager? If you don't get a new clearance, it's no real big deal.....unless your MOS requires one.

You need to contact your security manager. Not having a clearance could affect your job or system access if a clearance is required. It’s an easy fix but you need to be proactive

I will admit, in the past clearance renewal could be a real pain in the ass.

Mine was recently renewed, and I was surprised how painless the process was. It was lengthy, but relatively straight forward, and independent of going through a unit S2 shop and chain of command that just got bounced around.

That said, as a USAR or NG there is a chance it might go unnoticed for a while. It depends on how well your unit is tracking it. However, once it's found it's expired and you need it there will be a world of hurt, and by then the chances of a seamless renewal goes down.

Get it done.