Player Embed Code: Download Embed Share DoD Leaders Participate in Panel on Security and Innovation Defense.gov Dec. 4, 2021 | 53:01 Gen. Charles Brown, Air Force chief of staff, and Heidi Shyu, undersecretary of defense for research and engineering, participate in a panel discussion on the state of the national security innovation base at the Reagan National Defense Forum. The forum offers the defense community a chance to discuss and debate how the United States can lead the world in an era of increasingly complex challenges and opportunities.