Some 2,200 Marines, part of Washington's efforts for humanitarian relief in quake-hit Haiti, left the country Wednesday, reducing the number of US troops there to 3,300, the US military said. The amphibious assault ship USS Bataan left Haitian waters having 'completed their support to Operation Unified Response,' said a statement from US Southern Command, responsible for military operations in the region. The departure comes after the 'decline in demand for the capabilities of the ship and its crew as relief efforts in the Caribbean nation transitioned from urgent life-saving activities to long-term recovery,' said the military. There are now around 3,300 US troops stationed there, Southcom spokesman Jose Ruiz told selfnews. During its two-month deployment following the devastating January 12 earthquake which killed over 220,000 people, aircraft based on the Bataan flew 2,200 aid missions, delivering nearly 560,000 liters of bottled water and 725,000 kilos (1.6 million pounds) of food rations, said the military. 