Jack Murphy talks with Dr. David Walton, retired US Army Green Beret, about his new book "Ruck Up or Shut Up: The Comprehensive Guide to Special Forces Assessment and Selection." Walton and Jack discuss what it takes to get through the rigorous assessment and selection process, some Green Beret history, and why you shouldn't spend thousands of dollars on "prep courses." You can find Walton's book on Amazon or follow the link above. This episode is brought to you by Homes For Our Troops, a nonprofit helping build and donate homes to injured post 9-11 veterans. Visit HFOTUSA.org for more information.