“Oh my God—we hit a little girl.” This was the single, shocking cover line of the October 1966 issue of Esquire. Inside was John Sack’s 33,000-word New Journalism masterpiece, M, in which he followed a single company of American infantrymen from Fort Dix, New Jersey, to the war in South Vietnam. With that story—the longest to ever appear in Esquire—Sack single-handedly invented what it meant to be an embedded reporter and reset the bar for what journalism could be: trenchant, moving, and at times funny and even rollicking, yet dead set on revealing in personal terms the most troubling and urgent issues of our time. Esquire executive editor Mark Warren, who was Sack’s last editor at the magazine, joins host David Brancaccio to discuss Sack’s legacy and why he remains the least known but arguably most important New Journalist of his generation.