Following the Vietnam War, Marine Helicopter Training Group 40 (MHTG-40) was deactivated and Marine Medium Helicopter Training Squadron-402 and Marine Heavy Helicopter Training Squadron-401 were combined to form HMT-204.
ベトナム戦争後、第40海兵ヘリコプター訓練群（MHTG-40）が解散され、第402海兵中型ヘリコプター訓練飛行隊および第401海兵大型ヘリコプター訓練飛行隊が統合されて、HMT-204が編成された。