John Sherwood interviews General Kenneth F. “Frank” McKenzie Jr., USMC Ret. about his new book The Melting Point: High Command and War in the 21st Century.  General McKenzie served as the commander of CENTCOM from March 2019 to April 2022. In that role, he oversaw the 2020 strike that killed Qasem Soleimani, the leader of the Iranian Quds Force; and America’s final withdrawal from Afghanistan in 2021.