The Patriot air defense missile has become a standard in anti-missile fighting over the years, and had its baptism of fire during the 1991 Gulf War, when they were deployed on Israeli territory and military bases on Saudi Arabia. Initially the Patriot was developed as a simple antiaircraft missile, but successive upgrades allowed them to obtain good results in the interception of ballistic missiles. The Patriot PAC-2 variant, (Patriot Advanced Capability-2), began its career in 1990 when the capacity of the warhead’s shrapnel was improved and new and improved algorithms of the search radar were able to shoot down ballistic missiles more efficiently. In the last years of the 90s the improvements known as “guidance enhanced missiles” or “GEM” were developed. These modifications led to four different missile groups with specific missiles for defense against ballistic missiles and against cruise missiles.
PATRIOT PAC-2 gallery and more info