1st Marine Division (United States)

Robert F. Castellvi is a United States Marine Corps major general who most recently served as Inspector General of the Marine Corps from 9 October 2020 to 1 May 2021. As Inspector General, Castellvi oversaw matters of institutional integrity, discipline and combat readiness in the Corps, maintaining credibility through impartial and independent inspections, assessments, inquiries, investigations, teaching, and training. He is also an ex-officio Member at the North Carolina Military Affairs Full Commission in Camp Lejeune, Jacksonville, North Carolina.

The 7th Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Air Ground Combat Center Twentynine Palms, California. Nicknamed the "Magnificent Seventh", the regiment falls under the command of the 1st Marine Division and the I Marine Expeditionary Force.

1st Combat Engineer Battalion is a combat engineer battalion of the United States Marine Corps. The unit, nicknamed "The Super Breed", is based at Marine Corps Base Camp Pendleton, California and falls under the command of the 1st Marine Division and the I Marine Expeditionary Force.

The 1st Reconnaissance Battalion (abbreviated as 1st Recon Bn) is a reconnaissance battalion in the United States Marine Corps. It is a stand-alone battalion with no parent regiment. Instead, it falls directly under the command of the 1st Marine Division. 1st Recon Bn is located at Marine Corps Base Camp Pendleton in San Diego, California.

3rd Assault Amphibian Battalion (3rd AABn) is one of two active duty assault amphibian battalions in the United States Marine Corps. The battalion is tasked with transporting US Marine forces and their equipment from assault ships to shore, and equipped with the Amphibious Combat Vehicle (ACV), which replaced the Amphibious Assault Vehicle (AAV). The battalion is part of the 1st Marine Division and the I Marine Expeditionary Force. The unit is based in Camp Pendleton in California.

5th Battalion, 11th Marines (5/11) was a High Mobility Artillery Rocket System (HIMARS) battalion consisting of four Firing Batteries and a Headquarters Battery. The battalion is stationed at Marine Corps Base Camp Pendleton, California. It is the first active duty HIMARS Unit in the Marine Corps. They fall under the command of the 11th Marine Regiment and the 1st Marine Division. This is the only battalion in the 11th Marine Regiment not using the M777A2 lightweight howitzer.

1st Battalion, 11th Marines (1/11) is an artillery battalion comprising five firing batteries and a Headquarters battery. The battalion is stationed at the Marine Corps Base Camp Pendleton in California. Its primary weapon system is the M142 HIMARS rocket artillery launcher and the M777 lightweight howitzer. The battalion is under the command of the 11th Marine Regiment, part of the 1st Marine Division.

The 2nd Battalion, 7th Marines (2/7) is a light infantry battalion of the United States Marine Corps. They are based at the Marine Corps Air Ground Combat Center Twentynine Palms and consist of approximately 800 marines and sailors. The battalion falls under the command of the 7th Marine Regiment and the 1st Marine Division.

The 3rd Battalion 7th Marine Regiment (3/7, V37) is an infantry battalion of the United States Marine Corps. They are based at the Marine Corps Air Ground Combat Center Twentynine Palms and consist of approximately 800 Marines. The battalion falls under the command of the 7th Marine Regiment and the 1st Marine Division. The battalion has seen combat in World War II, the Korean War, the Vietnam War, the Gulf War and was a part of the main effort during the initial invasion of Iraq in 2003. During the Global War on Terror, the battalion saw eleven sequential combat deployments; five in support of Operation Iraqi Freedom, three in support of Operation Enduring Freedom, and three in support Operation Inherent Resolve. The unit has a long, decorated history with countless achievements. Its members were described as "true professionals" by embedded reporters during the 2003 invasion of Iraq.

1st Battalion, 5th Marines (1/5) is an infantry battalion in the United States Marine Corps based out of Marine Corps Base Camp Pendleton, California consisting of approximately 800 Marines and sailors. Nicknamed Geronimo, it falls under the command of the 5th Marine Regiment and the 1st Marine Division. The battalion was formed in 1914 and has served in every major conflict that the United States has been involved in since then.