Army air models within the US have been grounded for coaching after lethal helicopter crashes in Alaska and Kentucky killed 12 troopers prior to now month.

Operations have been suspended with quick impact till personnel bear instruction.

For active-duty models, the coaching will happen within the coming week, whereas nationwide guard and reserve troops may have till 31 May to finish the course.

"The move grounds all army aviators, except those participating in critical missions, until they complete the required training," the US Army mentioned in a press release.

On Thursday, two military helicopters collided close to Healy, Alaska, killing three soldiers and injuring a fourth.

The plane from the first Attack Battalion, twenty fifth Aviation Regiment at Fort Wainwright, close to Fairbanks, had been coming back from coaching on the time of the crash, in line with the military.

The unit is a part of the eleventh Airborne Division, which is nicknamed the Arctic Angels.

Military investigators have travelled to the scene of the crash.

The military on Thursday mentioned two of the troopers died on the website and the third on the way in which to a hospital.

The injured soldier is claimed to be in a secure situation

Referring to the choice to floor flight models for coaching, military chief of workers James McConville mentioned: "The safety of our aviators is our top priority, and this stand down is an important step to make certain we are doing everything possible to prevent accidents and protect our personnel."

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The crash is the second accident involving navy helicopters in Alaska this 12 months.

In February, two troopers had been injured when an Apache helicopter rolled after taking off from Talkeetna.

In March, nine soldiers were killed when two US Army Black Hawk medical evacuation helicopters crashed throughout a routine night-time coaching train about 30 miles (50km) northeast of Fort Campbell, Kentucky.

Speaking on the time, US Army secretary Christine Wormuth referred to as it a "heavy day", with the accident one of many worst for the navy lately.

The military has mentioned whereas Thursday's crash and the one in Kentucky stay beneath investigation, "there is no indication of any pattern between the two mishaps".