I encountered this image and wondered if America could've adopted another helmet design during WW1 and perhaps WW2 based on these designs instead of the brodie helmet.
The chief alternatives to the British/American helmet during World War I were the French "Adrian" helmet and the German Stahlhelm and I don't see the US adopting either of them. There is a fascinating discussion of the military helmets of the twentieth century in Our Own Devices: The Past and Future of Body Technology (New York: Alfred A. Knopf 2003) by Edward Tenner (full disclosure: he's my brother):