Oberleutnant Immelmann is also wearing a Imperial Sword portepee on his sidearm. The sidearm is being worn in a frog with what appears to be a securing strap for the handle.
Flying master Fabeck is wearing his bayonet suspended from a frog. He is also wearing an Impe-rial Naval dagger portepee tied around the hilt of this sidearm. This bayonet also has a short se-curity strap snapped around the handle.
This writer has observed a photo of at least one flying officer wearing the rare experimental model 15 type I sidearm, with the massive cast hilt with small inserted wooden grip scales. In every case these sidearms are worn with pride by these daring flying officers.
Wearing the traditional Hirschfanger was another sidearm option for flying officers.
Generally these edged weapons associated with the German hunt, were also worn with frog and portepee.