The United States, South Korea and Japan conducted combined naval exercises in a show of strength against North Korea.
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.
Even as more troops participate in cold-weather training, injuries associated with the cold are on the way down.
Japan invaded Attu in June 1942 and held the Attuans captive in Japan. The invasion prompted the only World War II battle on North American soil.
The MH-60 Jayhawk crashed during a rescue mission on Nov. 13.
North Korea claimed Wednesday to have successfully placed a spy satellite into orbit with its third launch attempt this year.
A Coast Guard spokesperson says all four crew members were taken to Seattle for treatment following the crash.
South Korean and U.S. troops have been conducting live-fire exercises.
The Silent Shark exercise comes as the aircraft carrier Ronald Reagan completed a port visit to Busan this month.
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