Lockheed Martin F-35 Lightning II procurement is the planned selection and purchase of the Lockheed Martin F-35 Lightning II, also known as the Joint Strike Fighter (JSF) by various countries. The F-35 Lightning II was conceived from the start of the project as having participation from many countries, most of which would both contribute to the manufacture of the aircraft and procure it for their own armed forces. While the United States is the primary customer and financial backer, the United Kingdom, Italy, the Netherlands, Canada, Turkey, Australia, Norway and Denmark have agreed to contribute US$4.375 billion toward the development costs of the program. Total development costs are estimated at more than US$40 billion (underwritten largely by the United States), while the purchase of an