▁it ▁might ▁be ▁a ▁good ▁idea ▁to ▁throw ▁in ▁a ▁nu ke ▁now ▁and ▁then , ▁just ▁to ▁keep ▁the ▁other ▁side ▁guessing ▁... " ▁D ys on ▁became ▁al ar med ▁and ▁obtained ▁permission ▁to ▁write ▁a ▁report ▁on ▁the ▁pros ▁and ▁cons ▁of ▁using ▁such ▁weapons ▁from ▁a ▁purely ▁military ▁point ▁of ▁view . ▁( This ▁report , ▁T act ical ▁N uc lear ▁We ap ons ▁in ▁S out heast ▁Asia , ▁published ▁by ▁the ▁Institute ▁for ▁Def ense ▁Anal ys es , ▁was ▁obtained , ▁with ▁some ▁re da ctions , ▁by ▁the ▁N aut ilus ▁Institute ▁for ▁Security ▁and ▁S ust ain ability ▁under ▁the ▁Fre edom ▁of ▁Information ▁act ▁in ▁ 2 0 0 2 .) ▁It ▁was ▁sufficiently ▁objective ▁that ▁both ▁sides ▁in ▁the ▁debate ▁based ▁their ▁arguments ▁on ▁it . ▁D ys on ▁says ▁that ▁the ▁report ▁showed ▁that , ▁even ▁from ▁a ▁narrow ▁military ▁point ▁of ▁view , ▁the ▁US ▁was ▁better ▁off ▁not ▁using ▁nuclear ▁weapons . ▁ ▁D ys on ▁opposed ▁the ▁Vietnam ▁War , ▁the ▁G ulf ▁War ▁and ▁the ▁invasion ▁of ▁Ira q . ▁He ▁supported ▁Bar ack ▁Ob ama ▁in ▁the ▁ 2 0 0 8 ▁US ▁president ial ▁election ▁and ▁The ▁New ▁York ▁Times ▁described ▁him ▁as ▁a ▁political ▁liberal . ▁He ▁was ▁one ▁of ▁ 2 9 ▁leading ▁US ▁scient ists ▁who ▁wrote ▁Ob ama ▁a ▁strongly ▁support ive ▁letter ▁about ▁his ▁administration ' s ▁ 2 0 1 5 ▁nuclear ▁deal ▁with ▁Iran . ▁ ▁Science