Marine Wing Communications Squadron 18 (MWCS-18) is a United States Marine Corps communications squadron. The squadron provides expeditionary communications for the aviation combat element of the III Marine Expeditionary Force. They are based at MCB Camp Foster and fall under the command of Marine Air Control Group 18 and the 1st Marine Aircraft Wing. Although a subordinate squadron of MACG-18, MWCS-18 is considered a 1st MAW asset and therefore serves to augment the entire 1st Marine Air Wing with communications support.