Maj. Gen. Daniel Butterfield, Hooker's chief of staff, was assigned the task of designing a distinctive shape for each corps badge. Butterfield also decided that each division in the corps should have a variation of the corps badge in a different color. Division badges were colored as follows:
Red — First division of corps
White — Second division of corps
Blue — Third division of corps
These were used in the United States' Army of the Potomac. These rules were adopted by other Union Armies, however it was not universal. For example, the XIII Corps never adopted a badge. Also, the XIX Corps had the first division wear a red badge, the second division wear a blue badge, and the third division wear white.
For Army corps that had more than three divisions, the standardization was lost:
Yellow — Fourth division of XV Corps (reportedly Orange was also used for a 5th Division Badge)
Multicolor — Headquarters or artillery elements (certain corps)
The badges for enlisted men were cut from colored cloth. Officer's badges were privately made and of a higher quality. Metallic badges were often made by jewelers and were personalized for the user. The badges eventually became part of the Army regulations and a great source of regimental pride.