Vanguard

Vanguard is a Trooper advanced class.

Unstoppable and utterly fearless, Vanguards wade into battle wearing advanced heavy armor. They are the first and best line of defense in the Republic military. These steadfast soldiers ignore personal risk, deliberately stepping into the line of fire to divert danger from allies and innocents.Though their tactical role is inherently dangerous, Vanguards have an uncanny survivability due to their expert defensive tactics and the advanced technology at their disposal.

Tank
The Shield Specialist Vanguard can withstand any incoming offensive. Boldly taking the brunt of the attack by depending on their heavy armor, shields, and taunts to defend themselves and draw fire away from their allies

Damage
The Plasmatech Vanguard stands on their own, striking their enemy with waves and rounds of raw incendiary power with continuous searing damage. The Tactics Vanguard use up-close vibroblades in the gut and a variety of explosives to eliminate their enemies quickly.

Skill trees

 * Shield Specialist - Powers up the Vanguard's shield generator to absorb firepower and protect their allies.
 * Plasmatech - Teaches explosives and grenades to complement either rifles or heavy cannons.
 * Tactics - Trains the Vanguard how to more effectively deal with close range combatants.

Ability rotations
for standard mobs, using the blaster and healing companion is fine

for groups, using harpoon and positioning yourself to use pulse cannon takes down groups well

For strongs/elites - burning cooldowns seems to work the best. Using the sticky grenade and shockstrike. Adrenaline rush and reactive shield allow for health regen. Especially for elites, using cyro grenade then No Retreat at the beginning will provide additional healing during the fight.

some fun combo attacks i use are 1) Cyro nade + Full auto so you get the full cast 2) Explosive round  + high impact bolt