Air Force Brig. Gen. Christopher Povak, Joint Task Force-Space Defense deputy commander, and Chief Master Sgt. Jacob Simmons, JTF-SD command senior enlisted leader, welcome Gen. Gary Thomas, assistant commandant of the U.S. Marine Corps, to Schriever Air Force Base, Colorado, on Dec. 11, 2020. The JTF-SD leaders briefed the general on space threats and the JTF-SD’s role in support of U.S. Space Command missions during his visit to the installation.