Helicopter Bell UH-1N Serial 31617 Register 158276 used by US Marine Corps USMC. Aircraft history and location Aircraft History 158276 US Marine Corps USMC 1997 MCAS El Toro./02 2007-08-16 Bell HH-1N conv to HH-1N. w/o 16aug07 Yuma Proving Grounds, Arizona 4 fatalities Send Updates Use APP to upload photo @ (optional) When Now? / / Send