CHESAPEAKE BEACH, Md. (Oct. 15, 2020) Stanley Karwoski, engineering technician at the U.S. Naval Research Laboratory (NRL), extinguishes a fire using a fluorine-free foam during a fire extinguishment test at NRL�s Chesapeake Bay Detachment (CBD) in Chesapeake Beach, Md., Oct. 15, 2020. The event tested the performance of aqueous film-forming foams and fluorine-free foams and compared their performances. (U.S. Navy photo by Jonathan Sunderman)