Under this plan, CH-53 and CH-46 helicopters were used to evacuate Americans and friendly Vietnamese to ships, including the Seventh Fleet, in the South China Sea. The main evacuation point was the DAO Compound at Tan Son Nhat; buses moved through the city picking up passengers and driving them out to the airport, with the first buses arriving at Tan Son Nhat shortly after noon. The first CH-53 landed at the DAO compound in the afternoon, and by the evening, 395 Americans and more than 4,000 Vietnamese had been evacuated. By 23:00 the U.S. Marines who were providing security were withdrawing and arranging the demolition of the DAO office, American equipment, files, and cash. Air America UH-1s also participated in the evacuation.