How many Marine Expeditionary Forces are there according to the flashcard information?

There are three Marine Expeditionary Forces (MEFs) in the U.S. Marine Corps structure. Each MEF is a large, combined-arms task force that is capable of conducting sustained combat operations and is composed of a reinforced Marine regiment, a logistics group, and support elements for command and control, intelligence, and reconnaissance. The three MEFs are typically located in different regions to ensure rapid deployment and response to crises globally. This triad allows the Marine Corps to effectively project power and provides a flexible and responsive force across various theaters of operation.