J. Kael Weston, former State Department adviser for the wars in Iraq and Afghanistan, talks about why he feels personally responsible for the deaths of 30 marines and one navy corpsman. "There's a memorial in South Boston that says, 'If you forget my death only then will I have died in vain,' and I think that's the cleanest , most powerful message that should apply to every war," Weston says. Book critic Maureen Corrigan shares her favorite suspense novels of the summer.