15 Minutes is a weekly interview podcast with the biggest names in the global security space. In a post–election special edition, The Cipher Brief's Executive Editor Fionnuala Sweeney talks to Jack Keane, retired four-star general and former Vice Chief of Army Staff. Fionnuala asks General Keane for his insight on President-elect Donald Trump's choice for Secretary of Defense, retired Marine Corps General James Mattis, who Keane recommended to the transition team.