Two new CH-47F Chinook helicopters from Company B, 2nd Battalion, 227th Aviation Regiment, 1st Air Cavalry "Warrior" Brigade, 1st Cavalry Division, hover in a holding pattern before lifting off on a training mission at Fort Hood Army Airfield, Fort Hood, Texas, July 10. One of the most notable differences between the "F" model and its predecessor, the "D" model, is that it has digital instruments inside its cockpit instead of analog dials and gauges.