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An Active Defense System, also shortened to ADS, is an advanced countermeasure used on vehicles during the 22nd Century. It appears in Battlefield 2142.
The ADS is an equipped module in both EU and PAC vehicles. It is a form of countermeasure designed to prevent anti-vehicular rounds and explosives from hitting the user's vehicle. ADS modules can be found on Air Transports, Gunships, APCs and Tanks.When ADS is activated, it projects a hazy green forcefield around the vehicle. This forcefield deflects any relatively slow moving rounds that makes impact with it. Rockets, missiles and AV Rounds are all deflected off the ADS. However, fast travelling bullets and plasma rounds are too fast to be deflected and can still hit the vehicle's hull. Most rounds that are capable of this do little damage to vehicles as it is, however anti-air rounds can still damage a transport or gunship with ADS activated.