Did Ann-Margret perform in Vietnam in revealing skirt?
More than likely; Bob Hope and his troupe made the normal runs there. One famous celebrity, possibly Raquel Welch, allegedly made the (HONEST) comment, "we're just teasing these men doing this...what these men really need are hookers!"
She more than spoke the truth; it was SOP (Standard Operation Procedures) to have MP's ring the performers during shows. MP's also provided escort to and from helicopters and hootches.