Question: Lockheed Martin F-35 Lightning II development started in 1992 with the origins of the Joint Strike Fighter program and is set to culminate in full production in 2018, unlike the F-22 Raptor, is intended to be available for export, the Lockheed Martin F-22 Raptor is a fifth-generation, single-seat, twin-engine, all-weather stealth tactical fighter aircraft, developed for which organization?

<P0-S0> Lockheed Martin F-35 Lightning II development started in 1992 with the origins of the Joint Strike Fighter program and is set to culminate in full production in 2018. <P0-S1>  The X-35 first flew on 24 October 2000 and the F-35A on 15 December 2006. <P0-S2>  The F-35 was developed to replace most US fighter jets with variants of one design common to all branches of the military. <P0-S3>  It was developed in cooperation with a number of foreign partners, and unlike the F-22 Raptor, is intended to be available for export. <P0-S4>  Three variants were designed: the F-35A (conventional take off and landing, CTOL), the F-35B (short-take off and vertical-landing, STOVL), and the F-35C (carrier-based CATOBAR, CV). <P0-S5>  Despite being intended to share most of their parts to reduce costs and improve maintenance logistics, by 2017 the design commonality was only 20%. <P0-S6>  The program received considerable criticism for cost overruns during development and for the total projected cost of the program over the lifetime of the jets. <P0-S7>  By 2017 the program was expected over its lifetime (until 2070) to cost $406.5 billion for acquisition of the jets and $1.1 trillion for operations and maintenance. <P0-S8>  A number of design deficiencies were alleged, such as carrying a small internal payload, inferior performance to the aircraft being replaced particularly the F-16, and the lack of safety in relying on a single engine, and flaws were noted such as vulnerability of the fuel tank to fire and the propensity for transonic roll-off (TRO or "wing drop"). <P0-S9>  The possible obsolescence of stealth technology was also criticized. <SEP> <P1-S0> Skunk Works is an official pseudonym for Lockheed Martin's Advanced Development Programs (ADP), formerly called Lockheed Advanced Development Projects. <P1-S1>  It is responsible for a number of famous aircraft designs, including the U-2, the Lockheed SR-71 Blackbird, the Lockheed F-117 Nighthawk, Lockheed Martin F-22 Raptor, and the Lockheed Martin F-35 Lightning II, which will be used in the air forces of several countries. <P1-S2>  Its name was taken from the moonshine factory in the comic strip "Li'l Abner". <P1-S3>  The designation "skunk works" or "skunkworks" is widely used in business, engineering, and technical fields to describe a group within an organization given a high degree of autonomy and unhampered by bureaucracy, with the task of working on advanced or secret projects. <SEP> <P2-S0> The Lockheed Martin F-22 Raptor is a fifth-generation, single-seat, twin-engine, all-weather stealth tactical fighter aircraft developed for the United States Air Force (USAF). <P2-S1>  The result of the USAF's Advanced Tactical Fighter program, the aircraft was designed primarily as an air superiority fighter, but also has ground attack, electronic warfare, and signal intelligence capabilities. <P2-S2>  The prime contractor, Lockheed Martin, built most of the F-22's airframe and weapons systems and conducted final assembly, while Boeing provided the wings, aft fuselage, avionics integration, and training systems. <SEP> <P3-S0> The Lockheed/Boeing/General Dynamics YF-22 was an American single-seat, twin-engine fighter aircraft technology demonstrator designed for the United States Air Force (USAF). <P3-S1>  The design was a finalist in the USAF's Advanced Tactical Fighter competition, and two prototypes were built for the demonstration/validation phase of the competition. <P3-S2>  The YF-22 won the contest against the Northrop YF-23, and entered production as the Lockheed Martin F-22 Raptor. <P3-S3>  The YF-22 has similar aerodynamic layout and configuration as the F-22, but with differences in the position and design of the cockpit, tail fins and wings, and in internal structural layout.