In December 1975, Advanced Range Instrumentation Aircraft transferred to the 4950th Test Wing at WPAFB. Following the July 1992 merging of WPAFB labs, the base's Wright Laboratory included a Flight Dynamics Directorate. Superfund sites (39 initial areas) of WPAFB were found to be contaminated with chlorinated volatile organic compounds and benzene compounds (soils and groundwater), and an EPA/USAF Federal Facilities Agreement was signed in 1981 for remediation and continued investigation (the Installation Restoration Program for WPAFB identified 65 areas, including 13 landfills, 12 earth fill disposal zones, 9 fuel or chemical spill sites, 6 coal storage piles, 5 fire-training areas, 4 chemical burial sites, and 2 underground storage tanks). In November 1995, the "Dayton Peace Accords" held at WPAFB created the "Agreement for Peace in Bosnia and Herzegovina" signed in Paris on 14 December.