 In 1991 president George H. W. Bush shifted the focus of SDI from defense of North America against large scale strikes to a system focusing on theater missile defense called Global Protection Against Limited Strikes (GPALS).In 1993 president Bill Clinton changed its name to the Ballistic Missile Defense Organization (BMDO) and its emphasis was shifted to theater missile defense and from global to regional coverage.BMDO was renamed to the Missile Defense Agency in 2002.