A display features mementos of Airmen who passed during the 1941 attack on Hickam Field at the Courtyard of Heroes in the Pacific Air Forces headquarters building, Joint Base Pearl Harbor-Hickam, Hawaii, Dec. 10, 2017. A remembrance ceremony was held at the courtyard for U.S. Army Air Corps Pfc. Joseph Nelles, a chaplain’s assistant, who was killed while setting up for a Catholic Mass during the attack. (U.S. Air Force photo by Tech. Sgt. Heather Redman)