This SERDP and ESTCP webinar will highlight two innovative projects developing PFAS-free fire suppression systems and fire extinguishing foams. Presenters will share field demonstration results from a high-pressure water mist system and advanced modeling of a new class of fire-extinguishing surfactants. The first project demonstrated the use of water mist fire suppression as an alternative for aqueous film forming foam (AFFF) in aircraft maintenance hangars. Water mist suppresses a fire by cooling, surface wetting, and oxygen displacement. Field testing took place at Tyndall Air Force Base, where the team evaluated the system's performance in suppressing both spill fires (on flat surfaces) and running fuel fires (in motion), in an aircraft hangar at the relevant operational scale. The second project evaluated the use of long-chain surface-active ionic liquids (SAILs) to extinguish hydrocarbon fires. The SAIL-F3 formulation provides various physical and chemical barriers to fire suppression in addition to favorable thermodynamic/kinetic conditions to generate cooling characteristics necessary for fire extinguishment and fuel-vapor suppression.