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POD circa 1938, you are the Armaments Minister of a small country. You see war clouds blooming and have read several predictions of what will be needed by 1945. Most of your armaments are WW1-surplus.
You want to re-arm your artillery before war breaks out. Your small country can only afford one gun for both anti-tank and anti-aircraft roles. The AT version must be compatible with tanks.
To ease logistics, these guns must share the same caliber and cartridge. You can chose a half-dozen different projectiles as long as they are all the same caliber and fit in a common brass casing. Ideally all barrels would be interchangeable.
What gun will you order for both AT and AAA roles?