Les,
Here you have 2 Browning designed weapons built for the US Army. The artillery is a 37mm AA gun M1. It was relegated to substitute standard when enough Bofors guns were available to replace it, and possibly supplied to allied armies, as seems to be the case with this example.
The other Browning design are those 2 tube-like things on top, which happen to be 50cal. machine guns M2, the water-cooled version of the famous M2,HB heavy machine gun.
I would consider this a rather unusual set-up, and hopefully someone can shed more light on it.
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George Cross Island
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