U.S. Air Force Maj. Lance Wu, Assistant Air Attache United States Defense Attaché Office-Beijing, China, screens dirt from a test pit during a site survey in the People’s Republic of China (PRC), Jan. 9, 2024. Test pits are used during surveys to test soil types and to see how deep possible aircraft wreckage can be found. Approximately 690 unaccounted-for American personnel from World War II are believed to be located within modern-day PRC. (U.S. Army photo by Staff Sgt. John Miller)