World War II and retirement
During World War II in 1942, he returned to Aberdeen Proving Ground to be a Major under Veblen until 1946. At Ballistic Research Laboratory Herman Goldstine. Goldstine remarked of Bennett, "“From time to time I was very impatient of Albert Bennett, who was a nice old gentleman—but he was a very precise, methodical, plodding person who drove me up the wall.” Goldstine also stated that Bennett describe their effort as "wrenching the equations into a form that could
be easily solved by very simple means." After the second world war, he was a ballistics expert in Tokyo, Japan where he reached the rank Lieutenant Colonel. In 1949, he graduated his second and final doctoral student Marlow Sholander. When he retired from Brown in 1958, he continued to teach as a visiting professor at Southern Illinois University, the University of Rhode Island, and Boston College. He taught at Boston College until one week before his death and upon his death he managed to be a charter member of MAA for 55 years.