He meant it more broadly than you suggest. He meant it in the same way that liberals from Kerry to Pelosi have always meant it: our troops are hated by the left and are considered by the left to be the chief instrument of evil in the world.
Murtha merely declared his solidarity with the left on this vile point.
I didn't hear that at all in his comments; maybe you are aware of another statement which lends support to your assertion. It will be interesting to see the text of his remarks tonight.
I agree with your interpretation of that statement.