I wonder if artillery gunners and bomber crews really chalked stuff on their munitions. Or was it all faked for the photographer? All those Kaiser or Hitler Special Delivery shells or bombs. Did people really bother? It's much the same when it comes to unit nicknames. All those Ladies from Hell, Devil Dogs or Green Devils. I have a feeling that enemy troops would not come up with awed descriptions of their opponents. I tracked down the term some German troops used for kilted regiments during the First World War. It wasn't exactly awe filled or respectful. It sounded like how German troops really would describe kilted soldiers and was more than somewhat disrespectful.