July 31st of each year is set aside by the International Ranger Foundation as World Ranger Day to honor park rangers around the globe who are on the front line in the fight to protect our natural heritage. It's also an opportunity to pay tribute to rangers who have lost their lives in the line of duty.

To honor this past Tuesday's World Ranger Day, on this episode of America's National Parks we're highlighting three stories of National Park Service rangers who have gone above and beyond the call of duty.