. ▁ ▁The ▁central ▁bar ra cks , ▁which ▁had ▁stood ▁since ▁ 1 8 5 1 , ▁were ▁torn ▁down , ▁save ▁one ▁segment ▁preserved ▁as ▁N ining er ▁Hall , ▁in ▁order ▁to ▁make ▁way ▁for ▁the ▁construction ▁of ▁Brad ley ▁and ▁Eisen h ower ▁Bar ra cks ▁between ▁ 1 9 6 5 ▁and ▁ 1 9 7 2 . ▁ ▁Washington ▁Hall ▁was ▁double d ▁in ▁size ▁and ▁phys ically ▁connected ▁to ▁Eisen h ower ▁and ▁Mac Ar thur ▁Bar ra cks , ▁which ▁had ▁replaced ▁the ▁old ▁North ▁bar ra cks . ▁ ▁In ▁ 1 9 6 9 ▁another ▁wing , ▁" Mac ▁Short ", ▁was ▁added ▁to ▁Mac Ar thur ▁bar ra cks . ▁ ▁New ▁bar ra cks ▁were ▁also ▁constructed ▁in ▁south ▁area , ▁with ▁Lee ▁Bar ra cks ▁and ▁Sh erman ▁Bar ra cks ▁being ▁constructed ▁in ▁the ▁mid ▁ 1 9 6 0 s . ▁ ▁The ▁final ▁major ▁construction ▁of ▁the ▁tw enti eth ▁century ▁in ▁the ▁academic ▁area ▁was ▁the ▁construction ▁of ▁Mah an ▁Hall , ▁named ▁after ▁Dennis ▁Hart ▁Mah an . ▁ ▁Mah an ▁Hall ▁is ▁home ▁to ▁the ▁a cademy ' s ▁Department ▁of ▁Civil ▁& ▁Mechan ical ▁Engineering ▁and ▁Department ▁of ▁Systems ▁Engineering . ▁It ▁contains ▁nine ▁levels , ▁over ▁ 7 5 ▁class rooms ▁and ▁labor ator ies , ▁and ▁holds ▁a ▁ ▁lecture ▁hall , ▁Arnold ▁Aud itor ium , ▁in ▁its ▁south ▁wing . ▁The ▁west ▁entrance ▁to ▁Mah an ▁Hall ▁used ▁to