Berlin Blockade continent for weeks. All too often, aircraft would make the entire flight and then be unable to land in Berlin. On 20 November 1948, 42 aircraft departed for Berlin, but only one landed there. At one point, the city had only a week's supply of coal left. However, the weather eventually improved, and more than 171,000 tons were delivered in January 1949, 152,000 tons in February, and 196,223 tons in March. By April 1949, airlift operations were running smoothly and Tunner wanted to shake up his command to discourage complacency. He believed in the spirit of competition between units and,
Viet Cong and Vietnam People's Army logistics and equipment equipment like bulldozers and rock crushers were deployed, and both miles of road built and truck traffic expanded. By the war's end almost a million soldiers had made the trip down the Trail and tens of thousands of tons were being transported annually. A massive American effort in the air failed to stop the men and material pushed forward by Hanoi. Bomb tonnages dropped on the Trail in Laos offer some indication of the scale of the American campaign: 1969– 433,000 tons, 1970– 394,000 tons (74,147 sorties), 1971– 402,000 tons (69,000 sorties). However, with only about 100 tons a day