Three weeks after Israel’s latest assault on the Gaza Strip concluded, Israeli military and political leaders attended a conference next to Ben Gurion Airport to sell the successes of what Israel dubbed Operation Protective Edge, which killed more than 2,200 Palestinians including 521 children. The annual conference, named “Israel Unmanned Systems 2014,” took place in business-as-usual atmosphere — even with a complimentary beer keg. But the fare was anything but humdrum.