Hey tincan866, was the film released the same year it was filmed? Maybe it has a different release date becuase they only showed the footage that was completed at the base. Then it was released after the rest of the film was finished. I know it might not be helping but these are just a few things that are rattling around in my head.
Also, maybe there is a site that shows military films and there release dates. I know this might be a long shot. But maybe somebody knows. I will try looking myself.