In 1914 the division was designated the 7th Division as part of a broad reorganization of the National Guard. On 29 June 1916 the 7th Division was mustered into service at Mount Gretna and deployed to El Paso, Texas, to serve along the Mexican border as the Regular Punitive Expedition entered Mexico. Major General Charles M. Clement commanded, directing the First Brigade comprising the 1st, 2nd, and 3rd Regiments, the Second Brigade the 10th, 16th, and 18th Regiments, and the Third Brigade the 4th, 6th, and 8th Regiments. There was also a regiment of cavalry and one of artillery, plus two companies of signals troops and medical units. The camp outside El Paso gained the title 'Camp Stewart' after the Adjutant General, Thomas J. Stewart. On 19 September, one brigade was sent home. On 14 November, the 1st Artillery left for home; the 18th Infantry left for Pennsylvania on 18 December; and the remainder of the division between 2–19 January 1917. It appears that most of the division was Mustered out of service 23 February 1917 at Philadelphia.