Player Embed Code: Download Embed Share Officials Brief Senate Subcommittee on Space Force, Space Operations and Programs Defense.gov May 26, 2021 | 01:20:59 Space Force Gen. David Thompson, vice chief of space operations; John Hill, performing the duties of the assistant secretary of defense for space policy; and Darlene Costello, acting assistant secretary of the Air Force for acquisition, technology and logistics; brief the Senate Armed Services Committee's Subcommittee on Strategic Forces regarding the Space Force, military space operations, policy and programs, May 26, 2021.