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Jefferson Proving Ground - Installation Support Management Agency
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Photo of self-propelled gun testing (select image for larger version)JPG’s primary mission was to plan, conduct, and report on ballistic acceptance production engineering surveillance and other tests of ammunition for the U.S. Army.

Its functions were to:

In addition, the Indiana Air National Guard used approximately 1,033 acres of the installation as an air-to-ground impact area for operational training requirements.