Only two fire groups, the HLL's and the ERML's. For the most part you want to play a slow tempo game where you can get multiple pokes from cover, exposing yourself only for your alpha strike burn time. Don't let your speed tempt you to work solo or engage first unsupported, you need to stay with the main group and complement other's firepower. Since you have excellent mobility, you work the extreme right or left of your team's firing line, and can react quickly to scoot around to the other side if needed to support or to seek a better firing position. Any rogue light that wants to threaten your heavies or assaults you can quickly try to move on and burn a leg off of. If you like going heavy, variant of this is upgrading the ERML's to HML's: (I prefer the ERML's, you want to be poking at 400 meters where possible) Two strikes, two cool shots, a lot of cool run, laser duration, etc, etc: Skill tree
Basically running the exact same build, only difference is I put one of the ERMLs in the left arm. Useful for UAVs.