U.S. Air Force Staff Sgt. Kateri T. Buser, emergency management specialist, 145th Airlift Wing, North Carolina National Guard, dips a pH paper into the unknown liquid during Prime Base Engineer Emergency Force, BEEF, week 2026 at the Regional Training Site, New London, N.C., Feb. 23-27, 2026. Prime BEEF Week serves as a readiness exercise, allowing Airmen to demonstrate proficiency in their primary functions through simulated wartime tasks that supports airfield operations in austere environments. (U.S. Air National Guard photo by Senior Airman Zeno Kang)