During an interview, Sgt. Slaughter said that when he turned heel, Vince McMahon wanted him to burn the American Flag, but Slaughter said no.
But when Hogan took the World Title from him @ Wrestlemania VII, Slaughter turned good and he said that he wanted his country back and became a TRUE American once again.
Now, there were others who tried to burn the American Flag as well:
In November 1999 on WCW Monday Nitro, the night after Mayhem
Shane Douglas tried to burn the American Flag after losing a match to Chris Benoit, but then, when Bret Hart who won the World Title @ Mayhem came to Benoit's Rescue, he prevented it from ever happening.
and @ the end, Benoit and Bret Hart both waved the Canadian Flag as well as the American Flag
Now in the WWE on RAW on The NEW TNN, the night after Summerslam in August of 2002, Test tried to burn the American Flag, but thankfully, The Dudleys and Kane came to the rescue and put an end to Test and The Un-Americans plans to burn the American Flag.