This great set of patches are for the United States Army Aviation Units. All of the patches are embroidered on twill and cheese cloth backed. All are in mint condition, un-sewn and from the 1960's or early 1970's period. There is an Orange with black helicopter for the Primary school, an orange and yellow, and a yellow and black. These all have a Sikorsky style chopper on them. The last is a blue with orange fixed wing plane for the Primary school. This is a neat grouping as you don't normally see anything but Primary school patches.