“During training about 20 miles (32 kilometers) off the southern coast of Yemen, a Black Hawk with 6 on board fell down.” said the US military officials
The incident took place when the helicopter was not very high above the water, U.S army spokesman Colonel John Thomas said.
Search is underway for a missing US service member. The five other service members aboard the helicopter had been rescued.
The Central Command noted that an investigation has been launched to determine the cause of the crash.
Yemen has been under regular US drone strikes, with Washington claiming to be targeting al-Qaeda elements, while local sources say civilians have been the main victims of the attacks.
In January and May, the US conducted deadly ground and aerial raids on Yemeni soil, leaving dozens of people dead.
