What is the size range of a Marine Expeditionary Force (MEF)?

The size range of a Marine Expeditionary Force (MEF) is indeed between 40,000 to 80,000 Marines and sailors. This large and versatile organization is designed to be a self-sustaining and formidable amphibious task force capable of conducting extensive operations across various environments. The MEF typically includes a command element, ground combat forces, aviation units, and logistical support, allowing it to operate independently and bring significant force to bear in combat situations.

Given the substantial size of a MEF, it can engage in major operations and campaigns, providing a robust response capability for the United States Marine Corps in various military scenarios. This distinguishes the MEF from smaller units like Marine Expeditionary Units (MEUs) or Marine Regimental Combat Teams, which operate at lower troop strength levels.