Since its creation in 1948, Israel has had to contend with the constant threat of terrorism. To meet this challenge, Israel has created and maintained an elaborate counterterrorism system. Much of the Israeli effort has focused on developing defensive measures designed to prevent attacks on the civilian population and minimize casualties. Israel has developed this strategy for two reasons. First, most Palestinian terrorist attacks, as well as a smaller yet significant number of attacks by Lebanese groups, have been random attacks against civilians. Second, all Israeli governments have been highly sensitive to civilian casualties.