Welcome to the DEFAERO Andy Marshall Strategy Series, our weekly discussion with leading thinkers on security, business and technology, sponsored by Bell. Our series is named after Andy Marshall, one of America’s greatest strategic minds, to mark the one year anniversary of his passing. Our guest is Lt. Gen. H. R. McMaster, USA, (ret.), Fouad and Michelle Ajami Senior Fellow at the Hoover Institution, Stanford University, the 26th assistant to the president for National Security Affairs and author of the recent book  Battlegrounds: The Fight to Defend the Free World.