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Espionage has been an essential part of warfare for millennia. Spies exceed in blending in and disguising themselves, allowing them to slip past enemy lines. Spies can provide a commander with invaluable assets when he infiltrates an enemy facility, but be wary of units that can detect them, as a Spy is unarmed. The Allied Spy is the cheapest infiltrator that can disguise.
Serving as the Allies' main espionage unit, the Spy's main purpose is to infiltrate enemy bases providing substantial benefits. Like other espionage units, they can disguise themselves to what infantry the commander need in order to slip past enemy lines. While lacking in special benefits compared to its new counterparts, it makes up for being slightly cheaper. To increase chances of successful infiltrations, Spies should be transported with either IFVs like the swift Stryker IFV or the airborne Stallion Transport.
Spy main advantages compared to its counterpart is their cheap cost.
As with other espionage units, the Spy can infiltrate an enemy building, but the effects will vary depending on the building:
- Barracks: All infantry will be trained as veteran.
- War Factory: All War Factory units will be produced as veteran.
- Radar: Battlefield will be reshrouded for the radar's owner.
- Power Plant: Owner's power will be shut down for 1:30 (2:00 for Nuclear Reactors).
- Ore Refinery: Steal $5000 from the refinery's owner.
- Ecobooster: Can see owner's money count.
- Tech Center/Palace/Battle Lab/Atomheart/Pandora Hub/Cloud Piercer: Partial prerequisite to unlock additional technology.
- Superweapon/support power structure: Resets the countdown of the superweapon/support powers.
- Construction Yard: Partial prerequisite to unlock additional technology.
- Field Bureau: Owner will lose all captured infantry technologies.
However, Spies are vulnerable once discovered by the enemy commander. It also vulnerable to Dogs, Spooks and other units that can detect disguised Spies rendering them ineffective. Another downside is that a building protected by walls will block off Spies unless the wall is torn down.
In the campaign, Spies are never trainable from the player's Barracks, and when available, almost always serve to accomplish an objective in the mission. The enemy can train them normally, and it's possible to gain access to an indefinite amount of them via mind control or abduction with Drakuv Prison Vehicles. In addition, they are prohibited from infiltrating labs and Construction Yards in the campaign, unless if that's a mission objective.
- In Peacekeeper, after the Tech Satellite Hack Center is captured, one of the player's PsiCorps Troopers will mind control the only Spy on the map, who must then be kept alive in order to infiltrate the Tech Center.
- In the first part of Eagle Fly Free, Spies are tasked with infiltrating a Tesla Reactor to disable the Tesla Coils blocking the path of Allied soldiers.
- The Allies have three Spies in Human Shield. All of them must be mind controlled by the player's PsiCorps Troopers, then infiltrate the Soviet War Factories on the map.
- In Hammer to Fall, the Mining Facility must be infiltrated by a Spy before being destroyed by the rest of the Allied forces.
- A Spy is given to the player at the beginning of Zero Signal. The player is instructed to use the Spy to infiltrate the Tactical Nuke Silo and buy more time before it fires, although this is not mandatory.
- In Puppet Master, the player will be given four Spies if the Allied Psychic Beacon is destroyed.
- In Stone Cold Crazy, the Allied Commander starts with four Spies in his disposal and can use them freely.
- In Ghost Hunt, a few minutes after the MCV is secured, a Spy will emerge from the Mine Shaft if it has not been destroyed.
- In the Covert Ops mission Fullmetal, shortly after the Allied base is established, two Humvees will be chronoshifted nearby, each carrying two Spies. Two more Humvees carrying Spies will arrive later. The player is instructed to use them to infiltrate the enemy Ore Refineries to achieve the objective of accumulating $250000, although this is not mandatory.
- In the Foehn Origins mission Tainted Empire, a few minutes after the initial Chinese attack on the Kanegawa Headquarters is repelled, six Spies will be given to the player. They can be used freely.
- The first objective in Mad Monster is to contact a team of Spies located south of the players' starting position. Once they're found, they'll fall under control of the players and must infiltrate the Soviet Control Towers.