Rioters carried many familiar flags during the January 6th insurrection at the United States Capitol -- Confederate, MAGA, as well as some custom-made ones like a flag of Trump looking like Rambo. Except for onlookers who were already familiar with the design, it would have been easy to overlook one particular bright yellow flag with three red horizontal stripes across the center. This was the flag of South Vietnam.There were actually several confounding international flags present at the Capitol riot that day: the Canadian, Indian, South Korean flags, all were spotted somewhere in the mayhem. But what was peculiar about the Vietnamese flag being there was that it's not technically the flag of Vietnam but the Republic of Vietnam, a country that no longer exists. And what this flag stands for (or should stand for) remains a really contentious issue for the Vietnamese American community.Changing Stripes