In 1967 "Chickie" Donohue, a merchant seaman, was inspired to deliver beers to buddies who were fighting in an unpopular war. And so, he packed up some suds and sailed for Vietnam to track them down. That quixotic adventure inspired the new dramedy "The Greatest Beer Run Ever," directed by Peter Farrelly, an Academy Award-winner for "Green Book." CBS News national security correspondent David Martin talks with Farrelly, star Zac Efron, and with Donohue, who describes how his experience changed his view of the war. #greatestbeerrunever #zacefron "CBS Sunday Morning" features stories on the arts, music, nature, entertainment, sports, history, science and Americana, and highlights unique human accomplishments and achievements. Check local listings for CBS Sunday Morning broadcast times. Subscribe to the "CBS Sunday Morning" YouTube channel: http://bit.ly/20gXwJT Get more of "CBS Sunday Morning": http://cbsn.ws/1PlMmAz Follow "CBS Sunday Morning" on Instagram: http://bit.ly/23XunIh Like "CBS Sunday Morning" on Facebook: https://bit.ly/3sRgLPG Follow "CBS Sunday Morning" on Twitter: http://bit.ly/1RquoQb Subscribe to our newsletter: http://cbsn.ws/1RqHw7T Download the CBS News app: http://cbsn.ws/1Xb1WC8 Try Paramount+ free: https://bit.ly/2OiW1kZ For video licensing inquiries, contact: licensing@veritone.com