At 15, Jason Redman walked into a recruiting office at 5-foot-nothing and 95 pounds and said he wanted to be a SEAL. The recruiter chased him out. He came back. Multiple times. The recruiter chased him out again. He almost joined the Army Rangers, failed a physical over a ruptured eardrum, found a new recruiter, and finally got in at 17. The lesson: being told you can't is fuel.