Hailed as "a masterful storyteller" by the Associated Press, Adam Makos is the author of the New York Times bestsellers A Higher Call, Spearhead, and Devotion, the subject of the major motion picture. Inspired by his grandfathers' service, Makos chronicles the stories of American veterans in his trademark fusion of intense human drama and fast-paced military action, securing his place "in the top ranks of military writers," according to the Los Angeles Times. In the course of his research, Makos has flown a World War II bomber, accompanied a Special Forces raid in Iraq, and journeyed into North Korea in search of an MIA American airman.

Marcus Brotherton is a journalist and professional writer known for his collaborations with high-profile public figures, humanitarians, inspirational leaders, and military veterans. He has authored or coauthored more than twenty-five books including We Who Are Alive and Remain, A Company of Heroes, Shifty's War, and Call of Duty.