1st Corps Patch
1st Corps Patch. Military spec 2 1/2' diameter color shoulder patch. The I Corps (First Corps) aka ('eye core'), nicknamed America's Corps, is a corps of the United States Army with headquarters in Fort Lewis, Washington. The I Corps serves under the U.S. Army Pacific Command (USARPAC). The current I Corps is a different organization from the I Corps of the Union Army during the American Civil War.