The crew of Marine Heavy Helicopter Squadron 362 flies the last mission of the CH-53D Sea Stallion in the Helmand Province of Afghanistan. The Marine Corps retires the 'D' model after 43 years of service. Video by Sgt James Mercure. Soundbite from Petty Officer 1st Class Jason Heavner. Also available in high definition DOD announces three units that will deploy to Afghanistan by winter 2012.