I hope not. He would be wrong to do that. Like it or not, the traditional meaning of the Purple Heart has always been the same : death or serious injury in battle against the known enemy, or in an environment where known enemy action is possible.
Since radical islam terrorism in not yet a known or recognized enemy within the continental United States, according to our commander-in-chief, cheapening a medal earned dearly is simply not possible.
Criminal negligence by said "commander"-in-chief, on the other hand, is a treasonous impeachable offence. Or should be, in a sane country governed by men of ethics and character.
There should be no question here of decedents’ eligibility for fatal injuries sustained in a Gen 4 war — which is a war perforce, Grotius and the old rules notwithstanding.