Cloaking field

From Command and Conquer Wiki

With the refinement and development of Nod stealth technology, the Brotherhood discovered a method of generating a permanent stealth bubble on mobile units, such as the Avatar or Scorpion tank. Deployed from the operations center, it generated a massive stealth bubble on the specified area, that rendered all vehicles in it invisible to the bare eye and most sensors. The effect was permanent, although the units could still be detected by advanced sensors or infantry.

The downside of the field was that it was extremely harmful to unprotected personnel, wounding or even killing infantry.