Uncle Ho is the colloquial name given to the president and prime minister of Vietnam, Ho Chi Min from 1890-1969. He led the Viet Minh independence movement
Nguyen Minh Triet is the current president of Vietnam. Presidency of Vietnam is a ceremonial position and the Prime Minister oversees the daily workings of the government.
Le Duc Anh is a former president of Vietnam from the period 1992 - 1997.
Uncle Sam is the national personification of the US government.