What is the primary location of the 1st Marine Division?

The primary location of the 1st Marine Division is Camp Pendleton, California. This division is one of the most prominent units in the United States Marine Corps and plays a crucial role in amphibious warfare and expeditionary operations. Camp Pendleton serves as a major Marine Corps base that provides the necessary training grounds and facilities for the division's personnel.

Located along the coast of Southern California, Camp Pendleton's extensive training areas and proximity to the Pacific Ocean make it an ideal base for a division focused on rapid deployment and readiness for combat situations. This location allows the 1st Marine Division to maintain high operational standards and conduct realistic training exercises that prepare them for various missions around the globe.

The other options, while associated with different aspects of the Marine Corps or specific units, do not serve as the primary base for the 1st Marine Division. Quantico is known for being the training hub for officers, Okinawa is a strategic location for Marine Corps bases in the Pacific, and Camp Lejeune is primarily associated with the 2nd Marine Division. Therefore, Camp Pendleton is rightly identified as the home of the 1st Marine Division.