Grenade - The basic grenade that almost every class gets. This can be used in a deadly manner for the soldier. When you are being chased lob one of these behind you. Well actually, if used in the right situation, they can be dangerous. For example, you hear an enemy sentry gun nearby.
Lets say it's around a corner . . .
You can also throw a nail grenade at crowds, it will harm most of them, and probably kill any scouts if they are in the blast radius. Double and single shotgun - You shouldn't have to use these 2 weapons, because the rocket launcher is just a way finer weapon. I guess you would use these if you are out of rokcets. And use the same hop and jump method when shooting with these weapons. You should always hop around when exchanging rockets with someone since this decreases your chance of getting hit.