approval. yesterday, chairman of the joint chiefs of staff, general joseph dun ford gave an update on the investigation. we owe you more information and the families of fallen more information, that s what the investigation is ziepd to identify. it includes did the mission of u.s. forces change during the operation? did your forces have adequate equipment and training? was there a pre-mention assessment in the area accurate? did u.s. forces become separated during the engagement? specifically sergeant johnson? and why did it take time to find and recover sergeant johnson? joining us now, nbc news national security and military reporter who has the lead by line about the emerging theory of what happened and nato supreme commander and the dean of dip plolomacy at tufts university, he is the chief