for more, we go to craig whitlock, a pentagon correspondent for the washington post and retired armyonel bob killebrew. he served in vietnam and is now a senior fellow at the center for a new american security, a think tank. craig whitlock, what more have you learned about this incident, what the soldiers were doing, what might have led to this. >> we know this unit, the photos were taken in 2010. so a couple years ago, the unit came back later this year but the unit has since redeployed to afghanistan. the army is trying to figure out where these soldiers were. the army says they know who most of them were but it's unclear whether some of them are back in the battlefield, back home or with other units. that's something we're trying to figure out. >> brown: how seriously is the military taking thisfter several epides recently. >> i think they're taking it very seriously. as we've seen in this pattern of unfortunate incidents of misconduct since january. that the pen pentagon, the field commanders in afghanistan and the white house convictly apologized. they say they're going to inves