Friday's drill involved F-35A fighter jets from both countries and other fighter jets from South Korea.
Military personnel stationed at Camp Lejeune from 1975–1985 had at least a 20% higher risk for a number of cancers than those stationed elsewhere.
The launch was the North's first this year.
North Korean leader Kim Jong Un said he would boost national defenses to cope with what he called an unprecedented U.S.-led confrontation.
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