Assault Craft Unit 5
Assault Craft Unit 5 (ACU 5) is the United States Navy's Pacific operating unit for the Landing Craft Air Cushion (LCAC). Headquartered at Marine Corps Base Camp Pendleton, California, their mission is transporting, ship-to-shore and across the beach, personnel, weapons, equipment, and cargo of the assault elements of the Marine Air-Ground Task Force. ACU-5 has over 400 sailors, organized in five departments. A part of the United States Pacific Fleet, ACU-5 administratively reports to Commander, Naval Beach Group 1, a part of Expeditionary Strike Group 3. Departments

Operations department 
The Operations department plans and executes the deployments of the unit's LCACs. Some of the sailors are deployed with amphibious readiness groups (ARG's). Maintenance department 
The ACU-5 Maintenance department has 5 maintenance groups that are in charge of the repair and upkeeping of LCACs. Supply department 
The Supply department is given an annual budget of 18 million dollars, and is required to catalog warehouses full uniforms, machine parts and equipment. Most of these warehouses have over 9,000 parts each. Training department 
The Training Department provides basic and advanced LCAC operational training to all members of ACU-5. Much of ACU-5's LCAC training is conducted by Expeditionary Warfare Training Group Pacific (EWTGPAC). Executive department 
The Executive department is in charge of any administrative, technical, or medical paperwork involving ACU-5. LCAC 
LCAC or Landing Craft Air Cushion are air cushion vehicles, operated by the U.S. Navy and Japanese Maritime Self Defense Force. The concept design for the modern day LCAC began in the early 1970s. The purpose of the LCACs are to "carry heavy vehicles and cargo" onto beaches at high speeds and over longer distances. The LCACs are currently undergoing a Service Life Extension Program (SLEP), which will be completed on all 72 craft by 2020. Operations 
During Operation Desert Storm in 1991, there were eleven LCACs stationed on the Persian Gulf; this was the LCAC's largest deployment. In 1992, ACU-5 deployed 3 LCACs to Japan and created a permanent military presence called detachment Westpac Alfa, which in 2012 became its own command, Naval Beach Unit 7, with 7 LCACS permanently stationed in Sasebo, Japan. ACU-5 conducted landings in Somalia to help with Operation Restore Hope. LCACs have also been used in support of civilian operations. In 2007, an LCAC was used to transport Los Angeles County Fire apparatus to Catalina Island to fight a wildfire. LCACs also provided relief to areas affected by the Indonesian Tsunami. References 

Amphibious units and formations of the United States Navy