Author, historian and Vietnam veteran Marc Leepson's new book, "The Unlikely War Hero: A Vietnam War POW's Story of Courage ...

AT A SEAL BASE, Somewhere in Vietnam — The Navy Seals are a slippery bunch of ... but when it is told, the books are certain to make fascinating reading.

What You Need to Know: The Smith & Wesson Model 39, inspired by the German Walther P-38, became the first American nine-millimeter pistol used by U.S. Navy SEALs during the Vietnam War.

They are an elite force in our United States military, but their missions are so top secret that learning about the Navy SEALs isn't exactly an open book ... for World War II's D-Day invasion.