The class the stars fell on is an expression used to describe the United States Military Academy Class of 1915. In the United States Army, the insignia reserved for generals is one or more stars. Of the 164 graduates that year, 59 (36%) attained the rank of general, more than any class in the history of the United States Military Academy at West Point, New York, hence the expression. Two reached the rank of five-star General of the Army. There were also 2 four-star generals, 7 three-star lieutenant generals, 24 two-star major generals and 24 one-star brigadier generals. Dwight D. Eisenhower, one of the five-star generals, went on to become the 34th President of the United States.

The term "the class the stars fell on" had previously been applied to the class of 1886, which produced a large number of general officers for World War I. Of this class, which included John J. Pershing, Charles T. Menoher, and Mason Patrick, 25 out of 77 (32%) became generals.

More Info: en.wikipedia.org