Thousands of snapshots make up the composite picture of Tom Brokaw's prolific NBC News documentaries. For more than 40 years, Brokaw has held a front-row seat to history while traveling the world to capture pivotal events like Ronald Reagan during his final days in the Oval Office; World War II veterans returning to the beaches of Normandy 40 years after D-Day; and a day in the life of young crew members aboard a nuclear aircraft carrier deployed to Afghanistan.