""The most proportional
response (to limited chemical weapons use) would be a strike on the units
responsible, whether artillery or airfields," said Jeffrey White, a former
senior official at the Pentagon's Defense Intelligence Agency and a Middle East
expert who is now a defense fellow at the Washington Institute For Near East
Policy [WINEP]. "It would demonstrate to Assad that there
is a cost to using these weapons - the problem so far is that there's been no
cost to the regime from their actions.""