Could lasers aboard aircraft like the F-35 shoot down enemy missiles as they launch? The Pentagon has batted around the idea for decades. But on Wednesday, its top scientists said he doesn’t think it’s practical, and said the Defense Department will put its research resources elsewhere.

“I want to put an end to that discussion. We’re not investing in airborne platforms for shooting down adversary missiles” with directed energy, said Mike Griffin, defense undersecretary for research and engineering.

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