Via Ea.com:
OFFICER
Officers make their teammates better. They wield special skills to buff Troopers, lock down enemy positions with automated blasters, and strengthen their allies.
ASSAULT
Fast, tough, and very effective at close-to-medium range, Assault clears the path and punches their way through enemy lines.
HEAVY
The Heavy takes territory and dominates it, providing the foundation for a team position.
SPECIALIST
Specialists employ deadly traps to harry enemy forces, reveal battlefield intelligence to their comrades, and snipe at enemies with long-distance weaponry.
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