U.S. Airmen from the 1st Expeditionary Civil Engineering Group construct additional water and sewage lines to prepare for a base expansion on Prince Sultan Air Base (PSAB), Saudi Arabia, Nov. 17, 2019. The U.S. is partnering with the Kingdom of Saudi Arabia in PSAB to enhance operational flexibility while maintaining security and stability in the region. (U.S. Air Force video by Senior Airman Matthew Zakrzewski)