Army leadership on Friday ordered an aviation stand-down after two fatal helicopter crashes, the most recent of which killed three soldiers and injured a fourth in Alaska on Thursday. “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,” McConville said in a statement. They were from the 1st Attack Battalion, 25th Aviation Regiment based at Fort Wainwright