In Ukraine and the Red Sea, low-tech drones are changing the way wars are fought. The U.S. and other countries are investing in a new and inexpensive way to retaliate: lasers. Compared with traditional weapons, lasers present some key challenges: they have a shorter range, limited power and can be harder to fix when issues arise. WSJ explains how the BlueHalo LOCUST laser weapon system works and why the tech is so difficult to perfect.
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