I read somewhere (how's that for a rigorous citation) that during World War 2 MacArthur had a way of really pissing off our Australian Allies. When some noteworthy goal had been achieved by the combined efforts of American and Australian troops Doug would generate a press release stating that American troops had done something or other. When some objective was achieved via purely Australian efforts the press release would state that American and Allied troops had accomplished something.
I think of that whenever I hear about an operation in Iraq that was conducted by "American and Coalition Forces". I get the impression that we are looking at the inverse of MacArthur. Instead of Americans always being mentioned whether or not they were there, we've got Coalition Forces getting credit for purely American operations. We wouldn't want anyone to think that the US is hogging all the glory.