The five-day course covers arctic medicine, combat patrolling, cold weather weapons and using snow for cover.
In one of his first public addresses as acting Navy secretary, Hung Cao said he didn't need "cross-dressers" or "leaf eaters" in the service.
The Navy welcomed the 26th Virginia-class fast-attack submarine to active service during a Saturday ceremony in Connecticut.
Ukraine unleashed a powerful new defense against Shahed drones that could blunt Russia's ability to force concessions in future negotiations.
By Ellen Ioanes
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