This is a monument to Owen Wister in Medicine Bow, Wyoming. Granted, it isn't in the "some gave all category", but we have strayed from the strict criteria that implies a bit. Wister is famous, of course, for writing The Virginian, in which Medicine Bow plays a prominent part.
The monument is located just outside of a museum, which was not open when I drove through and stopped (I'm afraid I've driven through many times and not stopped). The same location has a plaque with a large collection of the local brands on it, scene here.