ICBM stands for Intercontinental Ballistic Missile and now you can launch them and it’s like in the real life. The ICBMs are launched from a series of different launchers and you can set the targets using a special tool.
As you expect, there are different types of ICBMs, each one being destructive its own way. For example, you can blow the enemy or, for more fun, you can watch them burn. Also the launchers can have radars and much more futuristic technology. Anyhow creating a ICBM costs a little bit too much, so if you create one, be sure you also know how to launch the rocket / missiles because you don’t want to waste the resources.
Besides the fact this seems easy to do, you better check a more detailed tutorial for knowing each step exactly about launching the stuff.