Who is CNSNews?
I don't think I've ever heard of them. Is the story accurate?* We'll know more tomorrow if the reported press conference takes place.
Relevance? Well, John Kerry manages to talk about his Vietnam experiences into just about every topic from the death penalty to housing. Since his experiences seem to be at the center of his claim of qualifications to be President, the opinions of those who served with him would seem relevant to the discussion.
*This is a pertinent question of any news story, regardless of whether it's from CNSNews or the New York Times.