Marine Light Attack Helicopter Training Squadron 303 (HMLAT-303), is a United States Marine Corps helicopter training squadron stationed at Marine Corps Base Camp Pendleton, California. Known as "Atlas", HMLAT-303 trains newly commissioned Naval Aviators, conversion pilots, and refresher pilots to fly the Bell UH-1Y Venom and Bell AH-1Z Viper. HMLAT-303 is also responsible for training Bell UH-1Y Venom crew chiefs. It is part of Marine Aircraft Group 39 (MAG-39) and the 3rd Marine Aircraft Wing (3rd MAW).