Player Embed Code: Download Embed Share Defense Officials Testify About Cybersecurity Defense.gov March 29, 2023 | 49:28 Air Force Lt. Gen. Robert J. Skinner, director of the Defense Information Systems Agency, and John B. Sherman, the Defense Department’s chief information officer, testify on enterprise cybersecurity to protect DOD information networks at a hearing of the Senate Armed Services Committee’s cybersecurity subcommittee.