Helicopter Bell UH-1E Iroquois Serial 6152 Register 154768 used by US Marine Corps USMC. Aircraft history and location Aircraft History 154768 US Marine Corps 1978-12-16HML-771 w/o 16dec78 HML-771 Engine failure due to bad O ring in transmission crashed in CT. injuring both pilots and crew. 1980-06 A AMARC / AMARG HML-771 to Davis-Monthan AFB HML-771 Send Updates Use APP to upload photo @ (optional) When Now? / / Send