21.  The United States began supporting the pro-Western government in South Vietnam, finally sending troops to fight a devastating war against Hanoi-led Communist forces.

22.  The U.S. bombing campaign was aimed at Communist forces and the participants convinced themselves their bombs would not affect civilians, McMahon said.

23.  They whisked to safety remaining American officials and panicked Vietnamese lucky enough to scramble aboard while Communist forces were penetrating the city.

24.  They fled Saigon as communist forces surged into the city and the U.S.-backed government announced an unconditional surrender.

25.  They later sided with American troops against communist forces during the Vietnam War.

26.  Two years later, the communist forces took Saigon -- now known as Ho Chi Minh City -- and reunited the country.

27.  Washington led U.N. allied forces against communist forces in the Korean conflict.

28.  Another soldier and a civilian were also wounded in the battle, the first major encounter between government and communist forces since the peace talks collapsed.

29.  China has regarded Taiwan as a renegade province since nationalists fled there after being routed by communist forces in a civil war.

30.  The nationalist troops fled to the island after they were defeated by the Chinese communist forces led by Mao Zedong.