Helicopter Bell UH-1N Serial 31685 Register 159209 used by US Navy USN ,US Marine Corps USMC. Aircraft history and location Aircraft History 159209 US Marine Corps 1996-11USMC Nov96 HMLA-369./SM-342 HMLA-369 USMC 2009 HMT-303 /QT HMLAT-303 US Navy 2011-09Sep11 HX-21 HX-21 2013-11 A KNHK Nov13 at NAS Patuxent River as a testbed aircraft assigned to NACRA! Send Updates Use APP to upload photo @ (optional) When Now? / / Send