MARFOREUR United States Marine Forces Europe. Also known as USMARFOREUR, headquartered Boeblingen, Germany, is the U.S. Marine Corps component of the U.S. European Command. MEU Marine Expeditionary Unit. MRE Meal, Ready-to-Eat or (humor): Meals Refused by Everyone. MRSI Multiple Round Simultaneous Impact. This is a modern version of the earlier "time on target" concept in which fire from different weapons was timed to arrive on target at the same time. It is possible for modern computer-controlled artillery to fire more than one volley at a target and have all the shells arrive simultaneously.