During WWII, what was the peak strength of the Marine Corps?

The peak strength of the Marine Corps during World War II reached approximately 500,000 personnel. This significant growth was primarily due to the needs of the war and the expansive military campaigns conducted in the Pacific Theater, where the Marines played a crucial role. As the demands for amphibious assaults and ground operations increased, recruitment efforts intensified, resulting in a substantial influx of Marines. The milestone of 500,000 reflects not only the operational capacity of the Marine Corps during this time but also highlights its evolution into a formidable fighting force as it adapted to the challenges faced in global warfare.