Of course, and considered it during WWI. Metric measurement is legal for trade in the US, but it's time to get rid of archaic measurement and catch up with the world.
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45 US tons is 40.82 metric tons.
Metric
There is no individual unit in the Metric system that is near one inch in the English system, I'm afraid.
The SI unit is a Newton. The old US unit is the pound-force or the poundal.
The metric unit is a millilitre. The metric unit is a millilitre. The metric unit is a millilitre. The metric unit is a millilitre.