Jacob Loucks Devers (/ˈdɛvərz/; 8 September 1887 – 15 October 1979) was a general in the United States Army who commanded the 6th Army Group in the European Theater during World War II. He was involved in the development and adoption of numerous weapons, including the M4 Sherman and M26 Pershing tanks, the DUKW amphibious truck, the Bell H-13 Sioux helicopter and the M16 rifle.