Britain's aerospace industry is, with France, the joint second largest in the western world after the United States, and exports around two-thirds of its output. It is the only one apart from the united states having total aerospace capabilities, as well as great depth in technical and management expertise. Activities of Britain's aerospace industry cover designing and constructing airframes aero-engines, avionics, guided weapons and space satellites together with a full range of components, systems, sub-systems and associated services. Firms undertake prime contractor responsibilities for major projects and act as a total procurement agency; for instance, for a complete defence infrastructure with equipment and support.