Remember there are two months left. Also, the US people by and large have a brain shelf life (a tolerance) of stories lasting about three weeks. After that, they get "tired of it". They "want to switch the channel". Kerry knows the American people's sentiment and short attention span. If he concludes he can win on this one, he will hope to let time wear it away and let it die down, like Clinton. Where they can't attack, they will either change the subject or let people's patience erode it for them.
ACCORDINGLY, IMHO, The Swiftboats has the potential for becoming overkill, the biggest damage is done in August/September, kerry is forgiven and forgotten in October, and in November comes up and surpasses Bush. So whatever the Swiftees have under their caps on Kerry and The 'Nam, I'd stretch it out a bit, and save plenty of it for about the final week of OCTOBER.
There have been reports that they are planning an October surprise.