HMM-164

Marine Medium Tiltrotor Squadron 164
Old HMMT-164 unit insignia
Active	July 1, 1962–present
Country	United States
Branch	United States Marine Corps
Type	Medium-lift Tiltrotor Squadron
Role	Assault support
Part of	Marine Aircraft Group 39 3rd Marine Aircraft Wing
Garrison/HQ	Marine Corps Air Station Camp Pendleton
Nickname(s)	"Knightriders" "Flying Death" (Vietnam)
Tail Code	YT
Engagements	Vietnam War *Operation Eagle Pull *Operation Frequent Wind Operation Desert Storm Operation Restore Hope
Commanders
Commanding Officer	LtCol. Eric M. Aschenbrenner
Executive Officer	Maj. Jason T. Barnes
Sergeant Major	SgtMaj. Irving M Green.
Aircraft flown
Cargo helicopter	CH-46 Sea Knight (1965-2015) MV-22B Osprey (2015-Present)

Marine Medium Tiltrotor Squadron 164 (VMM-164), is a United States Marine Corps tiltrotor squadron operating the MV-22B Osprey. Known as the Knightriders, they fall under the command Marine Aircraft Group 39 (MAG-39) and the 3rd Marine Aircraft Wing (3rd MAW). They are based at Marine Corps Air Station Camp Pendleton.

Marine Medium Helicopter Squadron 164 (HMM-164) was activated under LtCol. Herbert J. Blaha on July 1, 1964 at Marine Corps Air Station Santa Ana, California as part of Marine Aircraft Group 36. In August 1965 the squadron transferred to Marine Wing Support Group 37 at Marine Corps Air Station El Toro, California. The squadron received the first CH-46 Sea Knights assigned to West Coast duty six months after activation.

HMM-164 brought the first CH-46 Sea Knight helicopters into Vietnam when they landed at Marble Mountain Air Facility after transiting from the USS Valley Forge (LPH-8) in March 1966. HMM-164 remained in Vietnam for a three and one-half years as part of Marine Aircraft Group 16 (MAG-16). During their time in country they operated in and around the following areas: Quảng Trị, Đông Hà, Khe Sanh, Huế, Phu Bai and off the decks of the USS Princeton (LPH-5), the USS Tripoli (LPH-10) and the Valley Forge. While in Vietnam, HMM-164 supported US forces in all the major operations, most notably in Operation Hastings and Operation Meade River. On July 15, 1966 while conducting the initial insertion of ground forces during Operation Hastings the squadron lost three CH-46A Sea Knights in the vicinity of LZ Crow near Con Thien. Two aircraft crashed when their rotorblades intermeshed while trying to avoid Marines on the ground and the third crash was caused by heavy ground fire.