To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Share Embed Share URL Video File Node URL Embed Code <iframe title="MRC TV video player" width="640" height="360" src="https://www.mrctv.org/embed/2507" allowfullscreen></iframe> Marcus Luttrell, a former Navy SEAL whose story of heroism in Afghanistan is told in his book "Lone Survivor," shared his world view at the National Rifle Association event in Louisville on May 16.