Israel’s air defenses---a multi-layered system that includes the famed Iron Dome---are among the best in the world and the most battle-tested, but even so they aren't completely impenetrable, Israeli officials and air-defense experts say.

Israeli air strikes have taken out about one-third of Iran’s ballistic missile launcher capacity, though officials say it will take weeks for the threat to be fully neutralized. Meanwhile, the Pentagon is surging air assets toward the region to be forward positioned, while Israeli leaders say the...

The Navy is sending the USS Thomas Hudner to bolster air defense systems in the region as fighting between Israel and Iran continues.