Milestones such as Eagle Scout, college class president, scholarship recipient, or valedictorian will help employers identify you as a potential winner. If you worked full time to put yourself through school, you should consider that experience a success indicator, and mention it on your resume. Anything that would be relevant to your prospective employer's needs. For example, if your occupation requires overseas travel or communication, list your knowledge of foreign languages. If you worked as a co-op student in college, especially in the industry you're currently in, let the reader know.
Employers generally react favorably to military service experience.
Some industries place a premium on clearances when it comes to getting hired or being promoted. This should be mentioned if your industry requires it. Dual citizenship should also be mentioned, especially if you think you may be working in a foreign country. In a competitive market, employers are always on the lookout for traits that distinguish one candidate from another. Not long ago, I worked with an engineering manager who mentioned the fact that he was a three-time APBA national power boat champion on his resume.