Mark with US Army Shoulder Sleeve Insignia: 310th | #401821

The United States Army is one of the three military departments (Army, Navy and Air Force) which reports to the Department of Defense. The modern US Army has its roots in the Continental Army, which was formed on 14 June 1775. A shoulder sleeve insignia (SSI), is an embroidered patch worn on some uniforms of the United States Army. The Sustainment Command is a United States Army logistics headquarters. The SSI in this image was approved for the 310th Sustainment Command in 1956.