Reyes Sierra PFAS Removal (IMAGE) University of Arizona College of Engineering Caption The presence of PFAS in firefighting chemicals means they often are found on military bases and in adjacent groundwater. Military firefighters, such as these at Davis-Monthan Air Force Base, undergo aircraft rescue firefighting training to hone their skills in preparation for the possibility of an aircraft fire. Credit U.S. Air Force/Airman 1st Class Michael X. Beyer Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.