Following the December 1941 attack on Pearl Harbor, Northwestern President Franklyn Bliss Snyder telegraphed President Franklin D. Roosevelt to volunteer the "entire resources of the University." The university admitted students who had finished three years of high school as well as instituting summer sessions to allow them to complete their degree requirements before the minimum draft age of 20. Notably, Northwestern switched its academic calendar from a semester to a quarter system to facilitate these changes and this quarter system persisted after the war into the present day.