At universities, appointments to top posts were the subject of power struggles between the education ministry, the university boards, and the National Socialist German Students' League.[356] In spite of pressure from the League and various government ministries, most university professors did not make changes to their lectures or syllabus during the Nazi period.[357] This was especially true of universities located in predominantly Catholic regions.[358] Enrolment at German universities declined from 104,000 students in 1931 to 41,000 in 1939, but enrolment in medical schools rose sharply as Jewish doctors had been forced to leave the profession, so medical graduates had good job prospects.[359] From 1934, university students were required to attend frequent and time-consuming military training sessions run by the SA.[360] First-year students also had to serve six months in a labour camp for the Reich Labour Service; an additional ten weeks service were required of second-year students.[361]