@icedquinn Except that the currency-type has little to nothing to do with war ("money is money").
WW1 took place under the gold standard, WW2 saw a limited gold bullion standard (and Bretton Woods), The Korean war + Vietnam war + Bamileke and many more happened under the Bretton Woods system before the "Nixon Shock" in 1971 when it all turned into fiat currency.
ISIS and ISIL were known to use BTC as well for their wars.