Not sure what this is and it might not be military but it looks U.S. due to the hanger. No markings that I can find. It is very similar to a S&W Victory model holster I found and these were not often marked.
https://www.milsurps.com/images/impo.../CxTN5qT-1.jpg
https://www.milsurps.com/images/impo.../f49ZGWb-1.jpg
