The Apache helicopter is the most advanced multi-role combat helicopter for the U.S. Army with unprecedented performance, advanced sensors, and connectivity. In fact, such a helicopter is considered the backbone of the U.S. Army attack helicopter fleet and other international defenses. These helicopters are commonly compared to dinosaurs when flying because of their ugly look, but it is definitely a deadly one.
Source: https://www.wearethemighty.com/mighty-tactical/16-photos-awesome-apache-helicopter/