Mary pretty clearly said earlier that she believed all of them, and it was clear she included Kerry in that.

I take it that means that she thinks they all believe what they say, and that she is not making any judgements at all about the actual facts of what happened out there.

That seems to me a fair enough position to take generally about these kinds of things. Memory is pretty unreliable in stressful conditions.

But a politically motivated advertising campaign accusing Kerry of lying maybe changes things a bit - it's not as if he'd been going around picking out former comrades and accusing them of lying in this way.