: Con serv ation ▁organizations ▁based ▁in ▁the ▁United ▁States ▁Category : Environment al ▁organizations ▁based ▁in ▁Chicago ▁Category : W ater ▁supply ▁and ▁san itation ▁in ▁the ▁United ▁States <0x0A> </s> ▁The ▁United ▁States ▁bi ological ▁weapons ▁program ▁began ▁in ▁ 1 9 4 3 ▁and ▁was ▁dis cont in ued ▁in ▁ 1 9 6 9 . ▁ ▁The ▁program ▁officially ▁began ▁in ▁spring ▁ 1 9 4 3 ▁on ▁orders ▁from ▁U . S . ▁President ▁Franklin ▁Ro ose vel t . ▁Research ▁continued ▁following ▁World ▁War ▁II ▁as ▁the ▁U . S . ▁built ▁up ▁a ▁large ▁stock p ile ▁of ▁bi ological ▁agents ▁and ▁weapons . ▁Over ▁the ▁course ▁of ▁its ▁ 2 7 - year ▁history , ▁the ▁program ▁weapon ized ▁and ▁stock p iled ▁the ▁following ▁seven ▁bio - ag ents ▁( and ▁purs ued ▁basic ▁research ▁on ▁many ▁more ): ▁ ▁Bac ill us ▁anth rac is ▁( anth ra x ) ▁Francis ella ▁t ular ensis ▁( t ul are m ia ) ▁Bru cel la ▁s pp ▁( bru cell osis ) ▁C ox iella ▁burn et ii ▁( Q - f ever ) ▁Venez uel an ▁equ ine ▁en ce phal itis ▁virus ▁( VE E ) ▁Bot ul in um ▁to x in ▁( bot ul ism ) ▁St ap hy loc oc cal ▁enter ot ox in ▁B ▁Through out ▁its ▁history , ▁the ▁U . S . ▁bi owe ap ons ▁program ▁was ▁secret . ▁It ▁was ▁later ▁revealed