The most common Indian motorcycle made for military use in World War II was the 741, a military version of the Thirty-Fifty.
These were primarily used by British and Commonwealth forces.
Indian sold more than 30,000 units of the 741.

The 640-B, a military version of the Sport Scout, was tested by the US Army and used on bases within the United States, but was not shipped overseas.
Approximately 2,500 were built.
The most common Indian motorcycle made for military use in World War II was the 741, a military version of the Thirty-Fifty. These were primarily used by British and Commonwealth forces. Indian sold more than 30,000 units of the 741.
The 640-B, a military version of the Sport Scout, was tested by the US Army and used on bases within the United States, but was not shipped overseas. Approximately 2,500 were built.
Indian Scout (motorcycle)