Why Did The West Point, NY Post Office Need Precancels?

Does anyone know who the specific users (by name or org'n) may have been for West Point, NY precancels?

It strikes me as odd that a post office on a military reservation would have significant need for precancels to meet mass mailing needs. The military, including Academy publications, would have had free-franking privileges, and there are few commercial interests on the reservation (possible exceptions include the Athletic Ass'n, the alumni ass'n, and the Thayer Hotel).

Any known responses, or better yet, examples on cover, would be really appreciated.

Thanks!

Not all military mail is "official" in a free-franking sense and those rules and regulation have changed over the years (The official stamps of the 1870s for instance).

Typical uses of precancels will be third class mailings from businesses often containing advertising or other printed matter. Also non-profit mailings from churches, scouts, charities and other organizations. The 1 and 1.5 cent values listed in your other thread directly apply to those rates. The survival rate is quite minimal.