My dad was in the navy and he said that at first they test you but then afterwards they don't usually do it unless you give them a reason to think your on drugs.

But I think joining the navy or any other armed services is a great idea. It will teach you to be a strong person inside and out. I thought about it but then I realised they wouldn't accept me b/c of my past with cancer and my bipolar and schizophrania, even though i'm fine now.