 Officers commissioned between November 1916 and November 1918 made up 55.4 percent of the Army's officers in 1926.This "hump" constituted a major personnel problem that was solved only by the Army's rapid expansion after 1940 in response to World War II.Much of the success of the class is attributable to the coincidence of being just ahead of the hump, but not too old to assume positions of great responsibility during World War II.