A Tom Toles cartoon featuring Donald Rumsfeld and a soldier in bed having lost his arms and legs has led to a letter being sent to the Washington Post from all five service-branch members of the Joint Chiefs of Staff and their chairman.
Here's the Washington Post summary of the Joint Chiefs reaction, the reaction of Toles' editor, and an initial show of support from a veterans' organization. Editor and Publisher weighs in here, noting the rarity of such a letter. Something called The Conservative Voiceweighs in with a conservative voice.
AMERICAblog.com has been covering the story pretty closely; I don't want to step on their links. You can get access to the letter through this entry, and another letter through here. They editorialize on the matter's importance here.