What is the song iron man really about?

"Iron Man" by Black Sabbath is often interpreted as a commentary on the dehumanizing effects of war and military technology. The lyrics describe a soldier who is sent to war and transformed into a powerful but soulless machine. He becomes a tool of destruction, capable of great violence but lacking any sense of humanity. The song serves as a cautionary tale about the dangers of unchecked militarism and the ways in which it can strip individuals of their humanity.