service. During the early part of 1916 the Corps continued its mission of training potential officers by sponsoring classes for enlisted men and civilians who later attended training sessions at Plattsburgh Barracks, NY. After the United States entered World War I in 1917, the Corps decided to convert to engineers when it was allowed to fill the requirement for the engineer regiment for the 26th Division, and on 22 May was redesignated as the 1st Regiment of Engineers (First Corps of Cadets), Massachusetts National Guard. The Corps reorganized as a regiment with many of its members becoming the officers and NCOs of the new organization. They immediately began recruiting to the regiment's authorized strength of 1,634. The 1st Engineers mustered into federal service on 20 June 1917 and began training in the Armory and at Wentworth Institute. With the entire Massachusetts National Guard in federal service, the state had to create a home guard organization for state duty. The Veteran Association organized the First Motor Corps as its contribution to the Massachusetts State Guard. The First Motor Corps was accepted for state service on 5 June 1917. Meanwhile, the Corps, as a new engineer regiment, began training to the best of its ability. In order to bring it up to strength, the 6th Massachusetts Infantry transferred 82 men, the 1st Maine Field Artillery transferred 100 men, and 479 Coast Artillery men from the Maine, New Hampshire and Rhode Island National Guards brought the Corps up to full strength. On 18 August, the Corps was officially redesignated as the 101st Engineers, 26th Division. On 15 September on the Common, the entire regiment paraded for the first time and was presented with a stand of new colors. The 26th was the first National Guard division and the second US Army division to deploy overseas in World War I. The 101st Engineers arrived in France in October; the advance party landed on the 19th, the 176th anniversary of the Corps, which justified a celebration that evening. Engineer troops were in short supply, and the Corps immediately went to work building barracks and hospitals. The Corps went into the line in February 1918 in the Chemin des Dames sector in the province of Ile de France and supported the 26th Division by rebuilding trenches, dugouts, and roads. The Corps also suffered its first casualties of the Great War. In late March 1918 the 101st