1921 to WWII - Tank Infantry Officer Coat Insignia - Embroidered on Khaki

Description

This is a Branch insignia for Infantry Tank Service Officer that was used from 1921 until the first part of World War II.
It has yellow embroidery on cotton khaki.
It was used on the summer khaki coat.
This example has the tank on top of two crossed rifles.  It measures 2 3/4 inches by 2 inches.
This insignia was replaced by the armored force insignia in 1942.