Pine Bluff Former Production Facilities: PBA once housed two chemical warfare production facilities, and NSCMP was charged with destroying them to comply with the CWC. Destroyed in 1999, the BZ Fill Facility filled munitions with the agent BZ, a hallucinogen. In 2003, NSCMP began demolition of the former Pine Bluff Integrated Binary Production Facilities (PB IBPF), designed to produce binary chemicals and fill binary chemical weapons. These weapons were designed to mix two non-lethal chemicals to form a chemical agent in flight to a target. The DF Production/M20 Canister Fill and Close Facility was the only facility operated. From 1988 to 1990 it produced the binary precursor methylphosphonic difluoride (DF), inserting the chemical into coffee can-sized M20 canisters for use in the M687 155 mm Binary Artillery Projectile. The BLU-80/B Bigeye Bomb Fill Facility, QL Production Facility and DC Production Facility never operated, and all were demolished. The final remaining PB IBPF building, intended to fill binary munitions for the Multiple Launch Rocket System, but never used for that purpose, was reutilized as the Pine Bluff Binary Destruction Facility (PB BDF), to neutralize the binary precursor chemicals DF and QL. After neutralization was completed in October 2006, demolition of the building commenced. Completed on Dec. 28, 2006, it marked the end of the PB IBPF demolition and the last former chemical warfare production facility destroyed in the United States. This accomplishment was significant since it enabled NSCMP to surpass the Chemical Weapons Convention (CWC) treaty milestone of demolition of all the nation's former production facilities four months ahead of schedule. Approximately 2,800 tons of metal were recycled from the IBPF.