What was the first offensive operation involving Marines in World War II?

The first offensive operation involving Marines in World War II was the campaign at Guadalcanal. This operation began in August 1942 and marked a significant shift in the Pacific Theater, where Allied forces, particularly U.S. Marines, launched their first major land offensive against Japanese forces.

Guadalcanal was pivotal for several reasons. It was strategically important as it was the first step in a series of operations aimed at driving Japanese forces away from Australia and securing sea routes in the Pacific. The harsh jungle environment and the tenacity of the Japanese forces presented numerous challenges, but the successful capture and defense of Guadalcanal established the capabilities and resolve of Marine forces.

The other options represent significant battles in Marine Corps history, but they occurred later in the war. For instance, Iwo Jima and Okinawa came much later, in 1945, while the Philippines campaign involved various engagements, with the significant amphibious landing occurring in late 1944. Hence, Guadalcanal is recognized as the first offensive operation, illustrating the Marines’ initiation of offensive action during World War II.