What was the name given to the first, preparatory, phase of the Gulf War? (2 August 1990 – 28 February 1991)

The Gulf War was a war waged by coalition forces from 34 nations led by the United States against Iraq in response to Iraq's invasion and annexation of Kuwait. The first phase, operations leading to the buildup of troops and defense of Saudi Arabia, was codenamed Operation Desert Shield (2 August 1990 – 17 January 1991). The second, combat, phase was codenamed Operation Desert Storm (17 January 1991 – 28 February 1991).