High Quality Content by WIKIPEDIA articles! Marine Medium Helicopter Squadron 364 (HMM-364) is a United States Marine Corps helicopter squadron consisting of CH-46E Sea Knight transport helicopters. The squadron, known as the "Purple Foxes", is based at Marine Corps Air Station Camp Pendleton, California and falls under the command of Marine Aircraft Group 39 (MAG-39) and the 3rd Marine Aircraft Wing (3rd MAW).