These are heavy metal helmets used in wars. On the right, the helmet could be from World War II or the Korea-Vietnam era. Why it was left outside to rust, we will never know.
The one on the left, from World War I, was found in a barn in Patagonia. The name “Steen” is on the inside. We don’t know who he was, but we hope he survived, as there is a bullet hole that enters one side and comes out the other.