J.T. suggests going to a site called ClearedJobs.new to look at openings requiring a security clearance—if you have one.
Then it’s up to you—where do you see yourself fitting in—private security, a quasi-military industry such as aerospace, armaments, logistics, govt procurement, one of the academies--where?
Then pinpoint your skills and attributes—team player, attention to detail, confidence, technical grasp, loyalty, and so on.
Many employers want someone who has operated under fire—sometimes, literally.
If you are in school, also check with your employment office—there are programs for vets.