“We’ve got about a 90% success rate,” he says, proudly giddy. “This is unprecedented in history.” It’s also impossible to confirm, but the lack of Israeli casualties suggests Iron Dome is the most-effective, most-tested missile shield the world has ever seen.

“We keep tweaking it,” says the senior official, who declined to be identified. “In one of the recent exchanges, one of the batteries was 100% [successful]. That means, to me, that Iron Dome is capable of 100% [across the board] — I don’t think it was entirely a fluke.” He said he didn’t know how many missiles and interceptors were involved in the salvo; an Iron Dome battery typically consists of a radar unit and three launchers, each outfitted with 20 Tamir interceptor missiles.

The bottom line: the more rockets Hamas fires, it seems, the better at stopping them Iron Dome becomes.