Slow Recharge
Heal all players immediately (and in last stand).
Field Upgrades in MWZ are completely different from the equipment available to Multiplayer Operators. There are six Field Upgrades, five of which are unlocked as you progress through your Military Player Ranks:
Energy Mine
Medium Recharge
Spawn an explosive, dealing massive damage to enemies who set it off.
Frenzied Guard
Slow Recharge
Repair armor to full and force all enemies in the area to target you for 10 seconds. Enemy kills repair armor during this time.
Healing Aura
Slow Recharge
Heal all players immediately (and in last stand).
Frost Blast
Medium Recharge
Damage enemies with the initial blast and slow those that enter the area of effect.
Aether Shroud
Medium Recharge
Become invisible to zombies.
Tesla Storm
Slow Recharge
For 10 seconds, lightning connects to other players, stunning and damaging normal enemies.