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This study sought to determine: (1) the relationship between variations in the properties of disruptors, and (2) the effectiveness of those disruptors in concealing military targets from visual detection when they are placed in various classes of natural background. A disruptor is an umbrella-like object attached to a target so as to obscure part of it. Test results indicate that: Targets are harder to find where the mean contrast level of the ground is close in value to the mean contrast level of the foliage, and where the variability around the mean contrast level is high; Small targets are easier to hide; and It is easier to obscure the outline of an elongated target than a compact target. To reduce the probability of a target being detected or of increasing the time required to detect it, the following suggestions are made. The target should be placed in an area with relatively dark ground and foliage, where ground and foliage are heterogeneous rather than homogenous. The color used as the basis for the disruptive material should be as dark as the ground. Disruptors should also have other colors which are even darker. It is most effective to use several small disruptors placed to break up target outlines as much as possible.