Final answer:
The HQ U.S. Marine Corps oversees the operations of this branch of the military, which has been involved in historical conflicts from World War II to the Iraq War. Notable historical actions include the flag raising on Iwo Jima and the implementation of the Good Neighbor Policy in Nicaragua.
Step-by-step explanation:
The Headquarters (HQ) U.S. Marine Corps is an integral part of the U.S. Armed Forces, playing a crucial role in many historical conflicts. It conducts amphibious and expeditionary warfare, as well as other ground-combat operations, and works alongside other U.S. military branches such as the Army, Navy, and Air Force. Iconic moments in Marine Corps history include the flag raising on Iwo Jima during World War II and the battle-hardened Marines fighting in the Pacific theater. The modern Marine Corps is also notable for its significant involvement in the Iraq War and other contemporary conflicts. Finally, it has been a part of historical peacetime actions like the implementation of President Roosevelt's "Good Neighbor Policy" when Marines were recalled from Nicaragua in 1932.
The resilience and operational scope of the Marine Corps are evidenced by historical photographs such as the image of the 28th Regiment raising the the American flag atop Mt. Suribachi, the presence of Marines in Nicaragua, and the bombing of their Beirut barracks in 1982. These images underscore the diverse roles the Marine Corps has played over time, from fighting in distant lands to being impacted by global terrorism. Also, the changing nature of military engagement is reflected in the evolution of the training and service commitment expectations of U.S. Marines and other servicemembers, as seen with the increased annual drill requirements mentioned post-9/11.