, ▁Maryland , ▁in ▁the ▁ 1 9 5 0 s . ▁The ▁human ▁subjects ▁originally ▁consisted ▁of ▁volunte er ▁en list ed ▁men . ▁However , ▁after ▁the ▁en list ed ▁men ▁st aged ▁a ▁sit down ▁strike ▁to ▁obtain ▁more ▁information ▁about ▁the ▁d angers ▁of ▁the ▁bi ological ▁tests , ▁Se vent h - day ▁Advent ists ▁( SD As ) ▁who ▁were ▁cons cient ious ▁object ors ▁were ▁rec ru ited ▁for ▁the ▁studies . ▁ ▁The ▁Army ▁purchased ▁an ▁additional ▁ ▁in ▁ 1 9 4 6 ▁to ▁increase ▁the ▁size ▁of ▁the ▁original ▁" Area ▁A " ▁as ▁well ▁as ▁ ▁located ▁west ▁of ▁Area ▁A , ▁but ▁not ▁cont igu ous ▁to ▁it , ▁to ▁provide ▁a ▁test ▁area ▁known ▁as ▁Area ▁B . ▁In ▁ 1 9 5 2 , ▁another ▁ ▁were ▁purchased ▁between ▁West ▁ 7 th ▁Street ▁and ▁O pp os sum town ▁Pi ke ▁to ▁expand ▁the ▁permanent ▁research ▁and ▁development ▁facilities . ▁ ▁Jeff rey ▁Alan ▁Lock wood ▁wrote ▁in ▁ 2 0 0 9 ▁that ▁the ▁bi ological ▁war fare ▁program ▁at ▁F t . ▁Det rick ▁began ▁to ▁research ▁the ▁use ▁of ▁insect s ▁as ▁disease ▁vectors ▁going ▁back ▁to ▁World ▁War ▁II ▁and ▁also ▁employed ▁German ▁and ▁Japanese ▁scient ists ▁after ▁the ▁war ▁who ▁had ▁experiment ed ▁on ▁human ▁subjects ▁among ▁P OW s ▁and ▁concentration ▁camp ▁in m ates . ▁Scient ists ▁used ▁or ▁attempted ▁to ▁use ▁a ▁wide ▁variety ▁of ▁insect s ▁in ▁their ▁bi