The Department of Defense's Strategic Environmental Research and Development Program (SERDP) is seeking environmental research and development proposals for funding beginning in Fiscal Year (FY) 2023. This solicitation provides funding opportunities for basic and applied research and advanced technology development. Projects vary in cost and duration consistent with the scope of the work proposed. The Statement of Need referenced by this solicitation requests proposals focused on the development of analytical methodologies for determining total per- and polyfluoroalkyl substances (PFAS) in PFAS-free firefighting formulations. Projects will be selected through a competitive process and proposals are due October 28, 2022.