Look at the orders of magnitudes differences in casualties in desert storm, iraq, and afghanistan. When Americans battle they ensure they have a massive power advantage for every fight and this is abundantly clear just from the casualty data. Even if the other side engages first like in desert storm, Americans ensure that they don't land boots unless they have a tactical advantage which they had in Desert Storm thanks to technology that Saddam and his army, which was one of the largest and experienced land forces in the world at the time, could not begin to compete with.