In 1942, the main workhorse-aircraft of the later part of the war came into service. The Halifax and Lancaster made up the backbone of the Command – they had a longer range, higher speed and much greater bomb load than earlier aircraft. Stirling and Wellington bombers were not taken out of service, but used on less demanding tasks such as mine-laying. The classic aircraft of the Pathfinders, the de Havilland Mosquito, also made its appearance. By 25 July 1943, the Bomber Command headquarters had come to occupy "a substantial set of red brick buildings, hidden in the middle of a forest on top of a hill in the English county of Buckinghamshire".