The United States Air Force is by far the largest operator of the F-35 Lightning II fighter jet; it plans to purchase a total of 1,763 F-35As (considerably more than all foreign air forces in the world combined). The US Air Force only operates the F-35A variant (with the Marines operating the F-35B and F-35C while the Navy operates the F-35C). The F-35A is the conventional takeoff and landing variant designed for air forces.