JPMorgan CEO Jamie Dimon said the U.S. should be stockpiling guns, ammunition and drones to bolster the nation against national security threats, during a fireside chat at the Reagan National Economic Forum in Simi Valley, California. JPMorgan CEO Jamie Dimon said the U.S. should be stockpiling guns, ammunition and drones to bolster the nation against national security threats, during a fireside chat at the Reagan National Economic Forum in Simi Valley, California.