VMM-164

VMM-164, formally Marine Medium Tiltrotor Squadron 164 and historically known as Marine Medium Helicopter Squadron 164, is a United States Marine Corps aviation unit based at Marine Corps Air Station Camp Pendleton in California. The squadron's nickname is the Knightriders, and its lineage stretches back to its activation on 1 July 1964 at Marine Corps Air Station Santa Ana. It began flying the UH-34D and soon became an important West Coast operator of the CH-46 Sea Knight medium-lift helicopter. The unit's early operational identity was shaped by the Vietnam War. In 1966 it became the first CH-46 squadron from the West Coast to deploy to Vietnam, operating from Marble Mountain Air Facility near Da Nang. Its missions included troop and cargo transport, assault support, casualty evacuation, logistics, and support to numerous Marine and allied operations. Early CH-46 operations exposed the aircraft to severe environmental and technical challenges, especially rotor vibration and compressor damage caused by sand. Field modifications, including improved filtration and defensive machine-gun installations, helped address these problems as the squadron accumulated combat experience. VMM-164 also played a role in later stages of the Vietnam conflict and in the evacuation of South Vietnam in 1975. During Operation Frequent Wind, the squadron supported the evacuation of Saigon and flew the final Marine security-guard evacuation from the United States Embassy on 30 April 1975. In the following decades it participated in Marine Expeditionary Unit deployments, disaster-relief missions, maritime security, and combat operations associated with Operations Desert Shield, Desert Storm, Restore Hope, Vigilant Sentinel, and Southern Watch. In 1999 the unit moved to Camp Pendleton and was redesignated HMMT-164, becoming the Marine Corps fleet replacement squadron for the CH-46E. In that training role it instructed pilots and enlisted aircrew and served as the CH-46E model manager and fleet project team manager. It also supported domestic emergency response, including California wildfire assistance in 2008. The squadron reportedly trained hundreds of pilots and crew chiefs during its years as a replacement-training unit. On 9 April 2015, HMMT-164 formally retired the CH-46E and transitioned to the MV-22B Osprey. The change ended its identity as a dedicated CH-46 training squadron and led to redesignation as VMM-164, a fleet operational squadron. The MV-22B combines vertical takeoff and landing with higher-speed, longer-range flight than conventional helicopters, allowing the unit to transport Marines, cargo, and selected personnel over extended distances. In spring 2018, VMM-164 made its first deployment as an Osprey squadron in support of Operation Inherent Resolve, where it provided aviation support and transported personnel, cargo, and VIPs. The squadron remains part of Marine Aircraft Group 39 and the 3rd Marine Aircraft Wing.

Marine Medium Helicopter Squadron 164 was activated on 1 July 1964 at Marine Corps Air Station Santa Ana under Lieutenant Colonel Herbert J. Blaha. Initially assigned to Marine Aircraft Group 36 and equipped with UH-34 helicopters, the squadron moved to Marine Corps Air Station El Toro in 1965 and became an early West Coast operator of the CH-46A Sea Knight. The squadron entered the Vietnam War in 1966. It sailed aboard USS Princeton, reached the western Pacific, and moved to Marble Mountain Air Facility near Da Nang on 8 March. This made it the first CH-46 squadron to join the conflict. The aircraft's early deployment was affected by rotor vibration and severe sand ingestion that damaged engine compressors. Operational modifications, including engine filtration and side-mounted machine guns, improved survivability and reliability. HMM-164 supported operations including Kings, Turner, Hastings, Macon, Beacon Star, Hickory, and Buffalo. It also served as a Special Landing Force helicopter squadron and operated with amphibious shipping in the South China Sea and waters near Vietnam. The unit continued Marine amphibious support through the late 1960s and early 1970s. It supported operations around Khe Sanh and other areas of northern South Vietnam, served with Marine Amphibious Units, and transported South Vietnamese forces during operations associated with the My Chanh defensive line and Lam Son 72. In 1975, composite aviation forces including HMM-164 aircraft were prepared for the evacuation of Cambodia and South Vietnam. During Operation Frequent Wind, HMM-164 provided transport, rescue, and air-cover support. One of its CH-46s evacuated the last Marine security guards from the roof of the United States Embassy in Saigon on 30 April 1975. After the Vietnam era, the squadron participated in the Marine Corps Unit Deployment Program and Pacific deployments. It supported relief operations after a major 1990 earthquake in the Philippines, maritime interdiction during Operation Desert Shield, combat support during Operation Desert Storm, and Joint Task Force operations in Somalia during Operation Restore Hope. It also supported Central Command activities in and around Kuwait and the Gulf region and flew in support of Operation Southern Watch. The squadron relocated to Camp Pendleton in January 1999 as part of a Base Realignment and Closure move. It was redesignated HMMT-164 in February 1999 and became the Marine Corps fleet replacement squadron for the CH-46E. Its responsibilities included pilot and enlisted-aircrew instruction, aircraft-model management, and fleet project-team work. It also participated in exercises and domestic support missions, including assistance during California wildfires in 2008. On 9 April 2015, HMMT-164 retired the CH-46E and completed its transition to the MV-22B Osprey. The unit was redesignated VMM-164 and returned to the fleet as an operational medium tiltrotor squadron rather than a dedicated replacement-training squadron. Its Osprey mission provides assault support, troop and cargo movement, and expeditionary transport for Marine air-ground task forces. In spring 2018, VMM-164 conducted its first deployment in the Osprey configuration in support of Operation Inherent Resolve. The squadron remains subordinate to Marine Aircraft Group 39 within the 3rd Marine Aircraft Wing and is based at Camp Pendleton.

• 2018

  First Osprey deployment

  [1]VMM-164en.wikipedia.org

  VMM-164 deployed in support of Operation Inherent Resolve as an MV-22B squadron.

• 2015

  Redesignation as VMM-164

  [1]VMM-164en.wikipedia.org

  The squadron retired the CH-46E, transitioned to the MV-22B, and returned to operational fleet status.

• 1999

  Move to Camp Pendleton and HMMT redesignation

  [1]VMM-164en.wikipedia.org

  The unit relocated to Camp Pendleton and became the Marine Corps CH-46E fleet replacement squadron.

• 1980

  CH-46E transition begins

  [1]VMM-164en.wikipedia.org

  HMM-164 became the first West Coast unit to receive the CH-46E and completed its complement the following year.

• 1975

  Support for Operation Frequent Wind

  [1]VMM-164en.wikipedia.org

  The squadron supported the evacuation of Saigon, including the final Marine security-guard extraction from the United States Embassy.

• 1966

  First West Coast CH-46 squadron in Vietnam

  [1]VMM-164en.wikipedia.org

  The squadron deployed to South Vietnam and began combat operations from Marble Mountain Air Facility near Da Nang.

• 1964

  Squadron activated

  [1]VMM-164en.wikipedia.org

  Marine Medium Helicopter Squadron 164 was established at Marine Corps Air Station Santa Ana.

A Marine Corps assault-support aviation squadron focused on rapidly moving troops, cargo, and selected personnel through the MV-22B Osprey's combination of vertical-lift capability, speed, and range.

• Tiltrotor aircraft · 2015

  MV-22B Osprey

  The MV-22B is VMM-164's current aircraft. Its nacelle-mounted engines rotate between vertical and forward positions, allowing helicopter-like takeoff and landing while providing greater speed and range in cruise flight. The squadron uses the aircraft for expeditionary assault support, movement of Marines and cargo, and selected personnel-transport missions.

• Medium-lift helicopter · 1965

  CH-46E Sea Knight

  The CH-46E was the squadron's principal aircraft for most of its history and supported combat operations, amphibious deployments, training, disaster response, and evacuations. HMMT-164 served as the Marine Corps fleet replacement squadron for the type from 1999 until the aircraft was retired from the unit in 2015.

• 2018Operation Inherent Resolve

  Middle East

  VMM-164 made its first MV-22B deployment and provided transportation for VIPs, troops, and cargo.

  Outcome. The deployment demonstrated the squadron's transition from CH-46 replacement training to operational Osprey support.

  Source
• 2008California wildfire response

  California · United States

  The unit provided medium-lift helicopter assistance after state authorities requested military support during severe wildfires.

  Outcome. Aircraft operated in support of United States Northern Command and the National Fire Center.

  Source
• 1992Operation Restore Hope

  Somalia

  While deployed with the 15th Marine Expeditionary Unit, the squadron supported Joint Task Force operations in Somalia.

  Outcome. The deployment continued through February 1993 and concluded with the squadron's return to California.

  Source
• 1990Operation Desert Shield and Operation Desert Storm

  Southwest Asia and Persian Gulf

  HMM-164 conducted maritime interdiction and subsequent combat-support missions during the Gulf crisis and war.

  Outcome. The squadron returned to California in April 1991 after supporting coalition operations.

  Source
• 1975Operation Frequent Wind

  South Vietnam

  The squadron supported the helicopter evacuation of civilians and at-risk South Vietnamese personnel from Saigon.

  Outcome. A squadron CH-46 evacuated the last Marine security guards from the United States Embassy.

  Source
• 1966Vietnam War

  South Vietnam

  HMM-164 conducted CH-46 assault-support and transport missions during major Marine operations in Vietnam, including Kings, Turner, Hastings, Macon, Hickory, Beacon Star, and Buffalo.

  Outcome. The deployment established the squadron as an experienced medium-lift combat unit, despite significant early aircraft and environmental problems.

  Source

• 2015

  Transition from CH-46E to MV-22BGeneration change

  Background

  The Marine Corps was replacing the aging CH-46 fleet with the MV-22B Osprey tiltrotor.

  Action taken

  HMMT-164 retired its CH-46E aircraft, converted to the MV-22B, and was redesignated VMM-164.

  Aftermath

  The squadron became an operational fleet unit and later deployed in support of Operation Inherent Resolve.

  Source

• 1999

  Conversion to CH-46E fleet replacement squadronStrategy

  Background

  Following its relocation to Camp Pendleton, the unit was selected to provide Marine Corps replacement training and aircraft-management functions for the CH-46E.

  Action taken

  It was redesignated HMMT-164 and assumed pilot, enlisted-aircrew, model-manager, and fleet-project-team responsibilities.

  Aftermath

  The unit trained new CH-46E aircrew until the aircraft was retired from its service in 2015.

  Source

1. 1VMM-164en.wikipedia.org
2. 2Marine Aircraft Group 39, VMM-164 unit page3rdmaw.marines.mil