CBS apologized to its viewers on Sunday after receiving criticism for a recent "The Amazing Race" episode set in Vietnam.

The reality competition, now in its 22nd season, visited the country for its March 17 installment. One segment took place at a war memorial in Hanoi and included footage of a wrecked U.S. B-52 bomber. Participants, who were looking for clues at the location, also heard a North Vietnamese Communist song.

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