 Registering with the Selective Service System is something every 18-year-old guy is required to do. That's the Selective Service, not the Secret Service. When you register with Selective Service, you won't be guarding the president. Nobody's going to give you sunglasses and a black suit. You know what happens when you register with Selective Service? You'll stay eligible for college loans, jobs, and training programs. If you're a guy turning 18, go to SSS.gov and register. No, karate classes are not included.