Over the history of the American-led Joint Strike Fighter program, at least two international F-35 partners issued an ultimatum to the US Defense Department to find a way to restrict US access to foreign militaries' sovereign data, or risk losing those countries as a customer. The core issue is in F-35's logistics system, known as ALIS. ALIS is used by F-35 operators in virtually all stages of flying and sustaining the Joint Strike Fighter. The system is used to plan and debrief missions, order spare parts, walk mainteners through repairs, and view technical data and work orders. But some partners on the F-35 program worried that data flowing through ALIS to the USA and Lockheed Martin could give both the U.S. military and the American defense contractor a window into that country's flight operations, including when and where its F-35s are flying. In August, 2018, the Defense Department awarded a 26$ million contract to Lockheed Martin to develop and test an 'ALIS Sovereign Data Management' system that will allow foreign partners to more tightly control and protect their own data. That effort has borne fruit and certain partners have begun using the new data guard, which rolled out earlier this year. The new data guard allows a foreign military to manage aspects of its data that is sent to the F-35 Hybrid Production Support Intergration team, basically allowing a partner nation to review and block data leaving the country.