Airman 1st Class Robert Dumback, 9th Maintenance Squadron aircrew egress systems journeyman, installs a D-ring guard on a U-2 Dragon Lady egress seat Jan. 14, 2020 at Beale Air force Base, California. A D-ring is the component of an egress seat that a pilot pulls to eject. The purpose of a D-ring guard is to protect the D-ring and prevent the accidental activation of an egress seat. (U.S. Air Force photo by Airman 1st Class Luis A. Ruiz-Vazquez)