Pine Bluff Arsenal, Arkansas

Pine Bluff is one of the nation's major chemical weapons facilities. The 14,943-acre installation has several large industrial areas for hazardous work, more than 600 buildings, and at least 267 storage igloos. It once stored 12.5% of the nation's obsolete chemical weapons, until their successful incineration over a five-year period, which concluded in 2010. Presently the facility is involved in the manufacture of smoke, incendiary, and pyrotechnic munitions (including white phosphorus), as well as in the fabrication, testing, and repair of chemical/biological filters, masks, and clothing. Biological weapons operations were conducted here from the 1950s until 1969.