It may consist only of signs of activity, such as simulated blast marks or wheel tracks.
Decoys are camouflage weapons of deception.
The use of decoys in combat zones depends on many factors. Decoys must be located in logical positions far enough away from actual targets to prevent enemy fire on the decoy from hitting the real installations. Decoy bridges, dumps, railheads, and airfields may be 2 to 5 miles from the real object, while decoy field artillery or antiaircraft-artillery batteries may be less than 1 mile away. In all cases, the location of real installations must be carefully considered when siting decoys so that the decoys do not draw fire on the real installations. Landmarks are likely to be used as enemy reference points.