The MIM-104 Patriot is a surface-to-air missile SAM system, the primary of its kind used by the United States Army and several allied nations and one of the most advance technology till today For a Patriot battery it cost a whooping One Billion Dollars (US$1 billion), while a single missile cost US$4 million.Comparing to the S-400, a single battery mobile long-range surface-to-air missile system, costs approximately $500 million.In this video we will look at how this system works in very basic form, we will also look at how the missile tracks and destroy its targets.