T31

T31 is a designation that has been used for several unrelated military vehicle concepts and design studies, rather than for a single production model. In historical reference, the T31 label most often appears in discussions of mid-20th century American experimental armored fighting vehicle programs. The various projects designated T31 were part of broader efforts to evaluate alternate chassis, armor layouts, propulsion, and armament during the World War II and immediate postwar periods. These programs typically produced prototypes and test data rather than mass-produced tanks, and the specific configurations associated with each T31 designation differed by era and mission.

Because the T31 label has been applied to more than one project, its exact meaning is context-dependent. Identifying the country, time frame, and vehicle class (for example, tank, armored car, or other chassis-based concept) is necessary to determine which T31 is being referenced. In many historical summaries, the designation appears alongside other experimental design numbers, sometimes with follow-on designs that bore different project codes.

Outside of historical or technical documentation, the string T31 also appears in popular culture and in gaming as a fictional or stylized vehicle designation, and such usages do not correspond to an official production model.

In summary, T31 denotes multiple, unrelated concepts within military vehicle history, and precise identification requires contextual cues.