Tank deployment at anti-war demo in the USA? Sure, the possibility that the tanks got lost and just wanted to ask for directions is certainly there. Because tanks are never equipped with radios and can never ask command for directions. And the alternative too - that they simply got stuck at a traffic light and that's why they were driving around there - sounds completely plausible. The suspicion that some trigger-happy military person or perhaps the tank crew themselves thought their appearance at an anti-war demo should clarify something to the demonstrators is probably pure paranoia.
At Warblogs:CC I found the original article.