A first-of-its-kind event to honor America's veterans and their families, the live three-hour concert aired on HBO and also featured Bruce Springsteen, Eminem, Dave Grohl, Rihanna, Chris Rock, and Carrie Underwood, among others.

In addition to honoring veterans, the concert also served as a fundraising event supporting a number of veterans' service organizations assisting servicemen and women with employment, education opportunities, health and wellness and integration back into civilian life.

"We're excited to play for those who have given so much of themselves for others as the night shines the spotlight on the more than 20 million American veterans who have served," said Metallica when announcing their appearance.