Workers making Browning machine guns at the Winchester Repeating Arms Company at New Haven (Connecticut), 6 April 1918. Part of the workforce were Yale alumni:
Arthur Huntington Gulliver, B.A. 1877. Born December 13, 1856, in Norwich, Conn. Died April 12, 1942, in Framingham, Mass. lived in Norwich 1911-29, insurance and investment security broker with exception of period spent as inspector Winchester Repeating Arms Company, New Haven (1917-19), resided in Framingham 1929-42.
Harry Borden Lovell, B.A. 1896. Born June 27, 1873, in New York City. Died April 24, 1942, in Taunton, Mass. commissioned Captain, Quartermaster Corps, June 11, 1917, and assigned to Fort Warren until discharge October 31, 1919; auditor Winchester Repeating Arms Company, New Haven, Conn, 1919-20.
Herbert Frank Seward, Ph.B. 1900. Born September 16, 1878, in New Haven, Conn. Died March 13, 1942, at Short Beach, Conn. head of order and sales department Waterbury (Conn ) Brass Company 1904-07, with Winchester Repeating Arms Company, New Haven, 1907-13.
Samuel Walter Avis, Ph.B. 1907. Born February 13, 1884, in New Haven, Conn. Died December 17, 1941, in Wellesley Hills, Mass Father, Samuel Roszel Avis, contractor Winchester Repeating Arms Company, New Haven, president The Avis Company, manufacturers of rifle barrels, West Haven, member Jefferson Guards, 2d Virginia Regiment of Militia;

Image source: Imperial War Museum
http://www.iwm.org.uk/collections/item/object/205082739
Yale alumni source: http://mssa.library.yale.edu/obituary_record/1925_1952/1941-42.pdf