The Pine Bluff Arsenal (PBA) is a US Army installation located in Jefferson County, Arkansas, just northwest of the city of Pine Bluff. PBA is one of nine Army installations in the United States that stored chemical weapons. PBA supplies specialized production, storage, maintenance and distribution of readiness products, and delivers technical services to the Armed Forces and Homeland Security. PBA also designs, manufactures and refurbishes smoke, riot control, and incendiary munitions, as well as chemical/biological defense operations items. It serves as a technology center for illuminating and infrared munitions and is also the only place in the Northern Hemisphere where white phosphorus munitions are filled.