I'm home at lunch watching Admiral Mike Mullen (Chairman of the Joint Cheifs of Staff) speak to soon-to-be-deployed troops at Camp Lejeune. Addressing the subject of civilian casualties, he said that killing civilians is a "strategic failure" that makes an otherwise successful mission a failure.
Adm. Mullen: killing civilians is a moral failure, not a strategic one. There is no acceptable level of civilian casualties in war. Killing innocent people is wrong, and when indiscriminate weapons are used it is murder.