command sergeant major michael hall thank you for your time. it is an honor to have you here. it is good to be here. let me ask you about the friendly fire incident richard was just talking about. i m not a military expert. it seems there are a bunch of different simple things to try to prevent friendly fire incidents, reflective patches and tape, gps beacons, that sort of thing. how is it these afghan troops weren t identified as friendlies. we sent a team to find out what happened. the systems didn t work, obviously, because we killed some friendly troops. we ll relook at the system and try to figure out what happened. i don t think it is a communications problem. in most cases like this you find the standard operation procedures weren t followed. that is my opinion. when these things like this happened it is like we didn t follow our own procedures or