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Call of Duty: Modern Warfare III

Reactor Field Upgrade Locations in MW3

By
Shane Williams

Reactor is the second Open Combat Missions and features the most amount of Weapons, Field Upgrades, Armaments, and Plate Carriers to discover in the game. If you’re striving for the Platinum Trophy, then you’ll need to collect all of these for the Gearhead Trophy/Achievement.

You’ll want to fully uncover the map before searching for the Weapons and Items.

All Reactor Field Upgrade Locations

There are a total of five field upgrades stored in small orange supply boxes scattered around the Reactor map which include Anti-Armor Rounds, Armor Box, Munitions Box, Snapshot Pulse, and Heartbeat Sensor.

Where to Find The Snapshot Pulse in Reactor

The Snapshot Pulse will reveal the locations of nearby enemies and it can be found by opening up your map and heading over to the south to find an entrance to a garage containing Fire Engines.

(1 of 2) Head to this location on the map

Head to this location on the map (left), to find the Snapshot Pulse. (right)

Where to Find The Heartbeat Sensor in Reactor

The Heartbeat Sensor will allow you to see if there are any nearby enemies above or below your current location. It can be found by opening up your map heading over to the circular building in the center of the map, and then making your way up the stairs to find the supply box sitting beside the yellow fence.

(1 of 2) Head to this location on the map

Head to this location on the map (left), to find the Heartbeat Sensor. (right)

Where to Find The Anti-Armor Rounds in Reactor

The Anti-Armor Rounds will allow you to temporally deal extra damage to armoured enemies and it can be found by opening up your map and heading over to the small garage in the northwest.

(1 of 2) Head to this location on the map

Head to this location on the map (left), to find the Anti-Armor Rounds. (right)

Where to Find The Munitions Box in Reactor

The Munitions Box does literally what it says on the tin and fully restores your ammo which is extremely useful in Open Combat Missions as you’ll be coming across a lot of enemies. It can be found by opening up your map and heading up to the rooftop of the building to the southeast of the circular building in the middle of the map.

(1 of 2) Head to this location on the map

Head to this location on the map (left), to find the Munitions Box. (right)

Where to Find The Armor Box in Reactor

The Armor Box is another useful piece of field equipment for Open Combat Missions, as you’ll be able to throw down some Armor Plates on the floor and equip for extra health. It can be found by opening up your map and heading into the small blue and white office building to the southeast of the circular building.

(1 of 2) Head to this location on the map

Head to this location on the map (left), to find the Armor Box. (right)

More Call of Duty Modern Warfare 3 Guides

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Guide Information
  • Publisher
    Activision Blizzard
  • Platforms,
    PS4, PS5, Steam, XB One, XB X|S
  • Genre
    FPS
  • Guide Release
    2 November 2023
  • Last Updated
    1 December 2023
    Version History
  • Guide Author

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Modern Warfare 3 is the next installment in the Call of Duty franchise and was developed by both Infinity Ward and Sledgehammer Games. It features reimagined maps from the original MW2 which was released back in 2009. This guide for MW3 contains the following:

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