I'm not so sure about the secutiry clearance, unless you want to actively pursue work within an organization that requires it - I assume you already have the most often required clearance: ITAR. Also, as Ben said, security clearance isn't easy to get - and you'd need to convince your current comapny that you need it to execute your job.
I'd take a good strong look at TestStand and PXI. ...and, since your profile lists your LabVIEW version as 8.6, I'd start playing around with the latest version.