>> Rheinmetall AG[a] (German pronunciation: [ˈʁaɪnmeˌtal]) is a German arms manufacturer, headquartered in Düsseldorf, North Rhine-Westphalia, Germany.

>> The most important rivers flowing at least partially through North Rhine-Westphalia include: the Rhine, [...]

Yes and 'Missouri Metalworks' is not a real steelmaker, and there are plenty of real *American corporations with names just as cool as Rheinmetall: Advanced Micro Devices/AMD, Texas Instruments/Ti, General Dynamics, General Motors/GM, International Business Machines/IBM. If you bring in defunct ones you get even more: Digital Electronic Corporation/DEC, Standard Oil.

I concede that I missed your Riverine connection between Missouri-Rhine but I think the first guy was focusing on the majesty/exotic-ness of "Rheinmetall" while "Missouri Metalworks" just sounds lame, most likely due to the fact that its fake!