Army aviators at 11 posts across the continental U.S. are in the midst of a safety stand-down following three helicopter training accidents that killed eight fliers in 10 days. The U.S. Army Forces Command ordered the stand-down effective Dec. 3 through through Dec. 7. It will affect about 1,000 helicopters and unmanned aircraft operated by several dozen units. During the stand-down, Army aviation leaders are to review operational factors, including the flight-mission briefing process, Army aircraft coordination training and adherence to flight-operations standards and discipline. On Nov. 23, two aviators from the 2nd Combat Aviation Brigade were killed in a Boeing AH-64 crash near Camp Humphreys, South Korea. The same day, four soldiers with the 2nd Battalion, 291st Aviation Regiment, First Army Division West were killed in a Sikorsky UH-60 crash in Fort Hood, Texas. On Dec. 2, two aviators were killed when their AH-64 crashed near Fort Campbell, Kentucky.