1 9 6 5 , ▁part ▁of ▁Be ale ▁A FB ' s ▁ 8 5 1 st ▁Str ateg ic ▁Miss ile ▁Squadron ▁system ▁of ▁several ▁IC B M s ▁centered ▁around ▁Mary sv ille . ▁Its ▁formal ▁design ation ▁was ▁Be ale ▁ 8 5 1 - C . ▁ ▁The ▁last ▁miss ile ▁was ▁lower ed ▁into ▁the ▁Ch ico ▁complex ▁ 4 C ▁on ▁April ▁ 2 0 , ▁ 1 9 6 2 . ▁ ▁The ▁Ch ico ▁miss ile ▁complex ▁had ▁two ▁acc idents ▁in ▁ 1 9 6 2 . ▁On ▁ 2 4 ▁May ▁during ▁a ▁contract or ▁checkout , ▁a ▁ter r ific ▁bl ast ▁rock ed ▁launch er ▁ 1 ▁at ▁the ▁complex , ▁destroy ing ▁a ▁T itan ▁I ▁and ▁causing ▁heavy ▁damage ▁to ▁the ▁sil o . ▁On ▁ 6 ▁June ▁trouble ▁again ▁struck ▁as ▁a ▁flash ▁fire ▁at ▁another ▁sil o ▁killed ▁a ▁worker . ▁After ▁the ▁investigation , ▁the ▁Air ▁Force ▁concluded ▁that ▁the ▁two ▁separate ▁explos ions ▁occurred ▁because ▁of ▁a ▁blocked ▁vent ▁and ▁blocked ▁val ve . ▁The ▁sil o ▁was ▁rep a ired ▁and ▁put ▁back ▁into ▁oper ational ▁service . ▁Today , ▁the ▁site ▁has ▁all ▁three ▁launch ▁sil os ▁c apped , ▁but ▁some ▁development ▁has ▁taken ▁place ▁on ▁the ▁launch ▁area ▁with ▁a ▁ret ention ▁p ond , ▁some ▁trees , ▁and ▁some ▁single - story ▁buildings ▁being ▁ere cted . ▁It ▁appears ▁to ▁be ▁in ▁use ▁for ▁some ▁type ▁of ▁quar ry