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Kim Jong Un announced his plans to prioritize nuclear weapons at the launch of North Korea's "tactical nuclear attack submarine."

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Marine launches Switchblade drone
A US Marine launches a Switchblade drone during an exercise at Camp Pendleton in California in September 2020.
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White mushroom cloud of the first hydrogen bomb test over the Marshall Islands.
The first hydrogen bomb test, as part of Operation Ivy, detonated over the Marshall Islands in 1952.