in regards to their lack of foresight of these countermeasures, causing many scientists to perform various studies and data analysis as to the true effectiveness of these countermeasures. Decoys A common countermeasure that attacking parties use to disrupt the efficacy of Missile Defense Systems are the simultaneous launching of decoys from the primary launch site or from the exterior of the main attacking missile itself. These decoys are usually small, lightweight dud rockets that take advantage of the interceptor sensors tracking and fool it by making many different targets available in an instant. This is accomplished via the releasing of decoys in certain phases of flight. Because objects of differing weights follow the same trajectory when in space, decoys released during the midcourse phase can prevent interceptor missiles from accurately identifying the warhead. This could force the defense system to attempt to destroy all incoming projectiles, which masks the true attacking missile and lets it slip by the defense system. Common types of decoys Since there can be many forms of this type of deception of a missile system, different categorizations of decoys have developed, all of which operate and are designed slightly different. Details of these types of decoys and their effectiveness were provided in a report by a variety of prominent scientists in 2000. Replica decoys This categorization of decoy is the most similar to the standard understanding of what a missile decoy is. These types of decoys attempt to mask the attacking ICBM via the release of many similar missiles. This type of decoy confuses the missile defense system by the sudden replication and the sheer number of similar targets. Knowing that no defense system is 100% reliable, this confusion within the targeting of the defense system would cause the system to target each decoy with equal priority and as if it was the actual warhead, allowing the real warheads chance of passing through the system and striking the target to increase drastically. Decoys using signature diversity Similar to replica decoys, these types of decoys also take advantage of the limitations in number within the missile defense systems targeting. However, rather than using missiles of similar build and trace to the attacking warhead, these types of decoys all have slightly different appearances from both each other and the warhead itself. This creates a different kind of confusion within the system; rather than creating a situation where each