depending on the branch. Such as standard infantry received yellow bands and Imperial Guard with red bands. The Type 45 olive service cap is a peaked cap similar in shape to that of the United States Army but with a smaller flatter crown and shorter visor. Red piping runs along the outer edge of the crown and the headband has a 1 1/2 inch wide red felt band. At the front of the red band is a gold star. The Imperial Guard service hat has a semicircular wreath of leaves below the star. The visor and chin strap are of black leather in standard military design. Field cap The Sen-bou is a cloth field cap with a short leather or (more usually) cloth peak. Originally produced in khaki it was later produced in various shades of green ranging from grey-green to a dark green. The cap was more of a peaked sidecap and could be worn with a neck flap (Bou-tare), hooked to the bottom for sun protection, made from four cloth rectangles Additionally, there was an “Ersatz” cap introduced in the 30’s made of felt and they were mostly seen being used in China. They fell out of use in to the 40’s. Metal helmets Adrian helmet – As with many countries, the IJA adopted and produced the French Adrian helmet. The IJA version of the Adrian was a one piece helmet unlike that of the French version. In addition, the IJA Adrian featured tie chin straps similar to samurai kabuto fasteners. Later versions featured the star insignia in front of the helmet. It also featured a star shaped vent on the top of the helmet. "Sakura" helmet – A further improvement of the IJA Adrian. It featured a Sakura shaped vent cover on top of the vent holes above the helmet in order to prevent water and dirt from leaking into the helmet onto the soldiers' heads. Type 90 – The Adrian helmet was later replaced by a Japanese designed helmet called the Type 90 (1930). It was officially called tetsubo (steel cap) but was called tetsukabuto ("steel helmet") by troops. It was made in the shape of a dome with a short protruding rim all the way around it (the paratroop version only had a short brim in the front). This helmet was made of a thin inferior chrome-molybdenum steel with many proving to be very fragile,