I got arrested in Va when I was 18 and three months. Will this Still affect me over ten years later if I want to join the US Navy? I have a Computer Information Systems degree. Is there any statute of limitations on disclosing misdemeanors?

No limitations on arrests and convictions. This isn't like your applying for a loan. In order to obtain a security cleatance everything must be disclosed up front and if you don't and it shows up in the investigation, you will be denied a security clearance. You don't want to risk that. Being honest about your past is one way to show that you have learned from past mistakes. Full disclosure isn't just the name of a movie, its what needs to occur.