With hanger fires out at the former Marine Corps Air Station (MCAS) Tustin, the U.S. Navy’s ground-water cleanup of carcinogenic contaminants continues and is likely for many years to come. According to Navy subject matter experts, the Navy has known that certain PFAS are present in ground-water associated with former MCAS Tustin for over 6 ½ years. Currently, the Navy is investigating the nature and extent of the cancer-causing chemicals and their impact on the soil and ground-water associated with the military base.