Preview: Former SEAL talks traumatic "stench of combat" and PTSD

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Mark Waddell, a retired Navy SEAL who served in Iraq, recalls the moment he knew he was struggling with post-traumatic stress, the moment he says "went straight to the core of my brain." For more from Waddell and his wife on the battle to regain intimacy after war, watch "CBS This Morning," Wednesday Dec. 12 at 7 a.m. ET.