(MWSS-171) is an aviation ground support unit of the United States Marine Corps. Known as “The Sentinels”, they are based out of Marine Corps Air Station Iwakuni, Japan. The squadron is part of Marine Aircraft Group 12 and the 1st Marine Aircraft Wing.
Their mission is to provide all essential Aviation Ground Support requirements to a designated fixed wing component of an Aviation Combat Element and all supporting or attached elements of the Marine Air Control Group. Additionally, the Squadron has the implied mission to supplement airbase facilities and services at Marine Corps Air Station Iwakuni, with support routed through MAG-12 for tasking.