WASHINGTON—Unmanned U.S. surveillance aircraft, with their suites of advanced technology, are the high-price product of years of domestic drone development during an era of nearly uncontested airspace.
So when Iran on June 20 shot down one of the Pentagon fleet’s top spy drones, it signaled that the U.S. may need a new strategy for facing rivals who are better-prepared than the extremist groups it has become accustomed to operating against.
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