The US doesn't have a Field Marshal grade, but before 1947, it could have been created by the president. I believe it requires an act of congress now. But the

The US doesn't have a Field Marshal grade, but before 1947, it could have been created by the president. I believe it requires an act of congress now. But there's little will to do it because of its association with aristocratic traditions in Europe. Which is why when FDR suggested it, it was interpreted as a joke.