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Some background on the Vietnamese Flag issue: From Wikipedia: the flag of the Republic of Vietnam (i.e., the flag of South Vietnam, pre-1975) and its importance to Vietnamese Americans:
• When a Vietnamese American video tape store owner displayed the communist [i.e., the current] flag in front of his store in Westminster, California in 1999, a month-long protest against it climaxed when 15,000 people held a candlelight vigil one night, sparking the Hi Tek Incident (Hi Tek was the name of the store).
• A faux pas by the United States Postal Service in using the current Vietnamese flag in a brochure to represent the Vietnamese American community that it serves cause some outrage among Vietnamese Americans and resulted in an apology.
• In 2004, some Vietnamese American students at the California State University, Fullerton threatened to walk out on their graduation ceremony to demand that the university use the former flag of South Vietnam as well as the current flag of Vietnam to represent its Vietnamese students. This resulted in the university scrapping all foreign flags for the ceremony.
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• In 2006, Vietnamese American students at the College of Engineering, UTA [University of Texas, Arlington] requested that the university add this flag in addition to the communist flag as a part of its student diversity in the Hall of Flags, Nedderman Hall. After several weeks of protests from the Vietnamese-American community in the area, the president removed all the flags from display in its Hall of Flags.
• Prior to President George W. Bush's visit to Vietnam in 2006, the White House website briefly displayed this [i.e., the old Republic of Vietnam] flag before replacing it with the current flag of Vietnam.
• The lobbying efforts of Vietnamese Americans resulted in the state governments of California and Ohio to adopt it to symbolize Vietnamese Americans in 2006.
The infamous Hi Tek incident, 1999