On April 28, these anti-Bosch army elements requested U.S. military intervention and U.S. forces landed, ostensibly to protect U.S. citizens and to evacuate U.S. and other foreign nationals. U.S. President Lyndon B. Johnson, convinced of the defeat of the Loyalist forces and fearing the creation of "a second Cuba" on America's doorstep, ordered U.S. forces to restore order. In what was initially known as Operation Power Pack, 27,677 U.S. troops were ultimately ordered to the Dominican Republic. The 4th Marine Expeditionary Force and the army's 82nd Airborne Division spearheaded the occupation. Psychological Warfare and Special Forces units also took part in the action.