Corps badges are not mentioned in the Regulations of 1861. These badges originated in General Philip Kearny's brigade of the Third Army Corps in June 1862 and were adopted for all the Corps of the Army of the Potomac on March 21, 1863. By the end of the war all but two Army Corps of the Union Army had adopted a corps badge. The badges above were pictured in the 1864 Schuyler, Hartley and Graham Catalog and correspond to the Corps existing in the Army of the Potomac prior to March 1864.