One fundamental problem with this idea is that if you don't already have a clearance it's very difficult to get a clearance. Getting a Top Secret or Special Acc

One fundamental problem with this idea is that if you don't already have a clearance it's very difficult to get a clearance. Getting a Top Secret or Special Access clearance can take 6 to 12 months, and costs the company a great deal of money. You could already have a job with a defense contractor, be a highly valued employee, they could desperately need someone with a clearance, and they will go outside to company to hire someone who already has a clearance rather than go through the process of getting you a clearance.