Player Embed Code: Download Embed Share Defense Department Officials Testify on COVID-19 Response, Part 2 Defense.gov Feb. 25, 2021 | 39:23 Stacy Cummings, performing the duties of undersecretary of defense for acquisition and sustainment; Robert G. Salesses, performing the duties of assistant secretary of defense for homeland defense and global security; and Army Gen. Gustave F. Perna, chief operating officer, Federal COVID-19 Response for Vaccine and Therapeutics, testify at a Senate Armed Services Committee hearing on DOD support to the COVID-19 response, Feb. 25, 2021.