From Defense Professionals:
Currently, infantry reconnaissance and infiltration operations are performed with conventional camouflage designed to conceal the soldier using two basic elements: colour and pattern. However, military operations in urban environments are currently becoming more prevalent in which the optimum colour and pattern could continuously change by the minute. For example, a soldier wearing a green colouration pattern would stand out against a white wall. An active camouflage system would continuously update the colour and pattern, concealing the soldier in the current environment.
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My Comment: I guess someone got hooked watching the "Predator movie" with Arnold Arnold Schwarzenegger.
Seriously .... the development of Active Camouflage Technologies to its logical conclusion (if successful) will be a revolutionary step in warfare.