The 28th Infantry Division ("Keystone")[1] is a unit of the Army National Guard and is the oldest division-sized unit in the armed forces of the United States.[2][3] Some of the units of the division can trace their lineage to Benjamin Franklin's battalion, The Pennsylvania Associators (1747-1777).[4] The division was officially established in 1879 and was later redesignated as the 28th Division in 1917, after the entry of America into the First World War. It is today part of the Pennsylvania Army National Guard, Maryland Army National Guard, Ohio Army National Guard, and New Jersey Army National Guard. It was originally nicknamed the "Keystone Division," as it was formed from units of the Pennsylvania Army National Guard; Pennsylvania being known as the "Keystone State". During World War II, it acquired the nickname the "Bloody Bucket" division by German forces due to the shape and color of its red keystone insignia.[5] But today the 28th Infantry Division goes by the name given to it by General Pershing during World War I: "Iron Division". The 28th is the first Army National Guard division to field the Stryker infantry fighting vehicle, as part of the Army's reorganization in the first decade of the 2000s. The 28th is also one of the most decorated infantry divisions in the United States Army.[6]