Can you join the US Army if you have tourettes?

You can, but you might want to reconsider enlisting. Those with ADHD are not typically well suited for military service and typically encounter difficulties. This is not the case for all. Some with ADHD do well in a very structured environment. If you are one of these, then by all means enlist. If your doctor is unaware of the ADHD then the chances are its not on record to which my advice is to keep quiet. Dont lie though if your doctor is aware as the military will check your medical records.