Like lasers, rocket trails also have different colours.
This is the standard colour for rocket trails. Note that hellstorm rockets will always use this colour trail.
Grey and RedEdit
For Grey and Red rocket trails, you must have Precision Targeter activated. These trails are also significantly larger than regular trails. If you have Rocket Fusion on your Skill Tree maxed out and you are using PLT-3030 rockets, they will fire to the side.
Have Rocket Fusion on your skill tree maxed out, you must not be using precision targeter or PLT-3030 rockets.
No Trails, But Rockets Have A Red GlowEdit
Have at least 1 pilot point in Heat Seeking Missles.
Rocket will fire to the side and hit target.