In the early 1950s, the U.S. military authorized a range of research and development projects for a new generation of tanks. The outcome of this was the Questionmark series of conferences. The TS-6 project was presented at one of these in June 1954. The key idea was to develop a vehicle that would be lighter than the Heavy Tank T43 (M103) and T110 but with similar technical characteristics. The project went no further than blueprints.