eg ot iation ▁might ▁be ▁required . ▁ ▁The ▁Army ▁picked ▁up ▁these ▁options , ▁developing ▁two ▁concepts . ▁The ▁first , ▁Project ▁Quick - Sh ot , ▁was ▁basically ▁identical ▁to ▁the ▁Feld ▁and ▁Ts ip is ▁version , ▁although ▁they ▁did ▁consider ▁some ▁sort ▁of ▁low - cost ▁guidance ▁system ▁as ▁well . ▁A ▁second ▁concept ▁launched ▁optical ▁track ers ▁into ▁space ▁in ▁the ▁path ▁of ▁the ▁incoming ▁miss iles , ▁and ▁used ▁their ▁data ▁to ▁fine - t une ▁the ▁launch ▁of ▁un gu ided ▁rock ets ▁that ▁would ▁work ▁at ▁longer ▁ranges . ▁As ▁this ▁had ▁no ▁rad ar ▁component , ▁it ▁would ▁by pass ▁prov isions ▁in ▁the ▁AB M ▁treat y ▁over ▁the ▁number ▁and ▁pla cement ▁of ▁rad ar ▁sites . ▁ ▁However , ▁they ▁also ▁considered ▁a ▁more ▁conventional ▁concept ▁using ▁what ▁was ▁essentially ▁a ▁version ▁of ▁H IB EX ▁and ▁UP ST AGE , ▁and ▁in ▁ 1 9 7 6 ▁they ▁placed ▁a ▁contract ▁with ▁Mc D onn ell ▁Douglas ▁to ▁study ▁a ▁low - alt itude ▁concept ▁under ▁the ▁name ▁ST - 2 , ▁using ▁a ▁nuclear - ti pped ▁miss ile . ▁This ▁proved ▁the ▁most ▁interesting , ▁and ▁led ▁to ▁the ▁Lo AD S ▁program ▁in ▁ 1 9 7 7 . ▁ ▁Lo AD S ▁concept ▁ ▁Lo AD S ▁proposed ▁placing ▁one ▁inter ceptor ▁in ▁one ▁of ▁the ▁de co y ▁sh el ters , ▁thus ▁every ▁set ▁of ▁ 2 3 ▁sh el ters ▁would ▁have ▁one