The New London paper The Day is skeptical of Richard Blumenthal's explanations:

[T]he comments claiming Vietnam service, though seemingly isolated, are what they are and not easily explained away.

And why did Mr. Blumenthal not act quickly to correct inaccurate reports in state newspapers that described him as a Vietnam veteran? The candidate explains he can't track all news reports about him. Yet this newspaper knows from experience that Mr. Blumenthal is quick to correct unflattering statements published about him or to refute opinions with which he disagrees. One reporter got a call from the attorney general for inserting a middle initial in his name. He has none.

UPDATE: Meanwhile, the Stamford Advocate unearths another "in Vietnam" quote.