This act authorizes the U.S. Fire Administration (USFA) to conduct on-site fire safety investigations of major fires and other fires under other specified circumstances. In the case of a major fire, the USFA may send incident investigators (e.g., safety specialists, fire protection engineers, codes and standards experts, researchers, and fire training specialists) to the site. Any such investigation shall (1) be conducted in coordination and cooperation with appropriate federal, state, local, tribal, and territorial authorities; and (2) examine the previously determined cause and origin of the fire and assess broader systematic matters. Upon concluding any such investigation, the USFA must issue a public report to federal, state, local, tribal, and territorial authorities on the findings of such investigation or collaborate with another investigating federal, state, local, tribal, or territorial agency on that agency's report. The act makes an exception where issuing a report would have a negative impact on a potential or ongoing criminal investigation. Additionally, the USFA may send fire investigators to conduct fire safety investigations at the site of any fire with unusual or remarkable context that results in losses less severe than those occurring as a result of a major fire, in coordination and cooperation with the appropriate federal, state, local, tribal, and territorial authorities.