The mission of the museum is to establish for the benefit of the public, a museum commemorating the life and accomplishments of USAF General Daniel “Chappie” James Jr. through the collection, preservation, and interpretation of related historical memorabilia, exhibitions, lectures, classes, programs, and activities that illustrate his lifelong achievements.
In order to get the coordinates to this physical bonus cache, you will need to complete the nearby Adventure Lab.
Due to the location of the cache in the middle of a neighborhood, I would recommend only going after this one during daylight hours.