Washington ? Four top officers at the Air Force Academy will be replaced — at least two of them by women — after a series of rape reports and allegations by female cadets of an academy culture that blames victims for assaults.

“The evidence indicates now that we need to have some changes in leadership at the top,” said Sen. Wayne Allard, R-Colo. “I think they’re moving in the right direction.”

Air Force Secretary James Roche briefed the Senate Armed Services Committee in private Tuesday to discuss the military’s response to allegations that female cadets at the academy were ostracized and reprimanded after they reported they were raped.

Sen. Hillary Rodham Clinton, D-N.Y., said Roche told senators that four leaders at the academy would be replaced and at least two women would be moved into top spots. She said the changes show progress, but more needs to be done.

“We don’t send (cadets to the academy) to become part of a fraternity where they defend one another and protect one another against criminal activities that keep going on, so it’s not just a change in leadership. It has to be a change in values from top to bottom,” she said.

The Air Force has identified 56 cases of rape or sexual assault reported at the Air Force Academy since 1993. Allard says 50 cases have been reported to his office, many by women upset with the way the academy handled their complaints and a significant portion occurring within the last two years.

Roche would not answer questions as he left the Capitol on Tuesday. Senate Armed Services Committee Chairman John Warner, R-Va., said personnel changes would be made, but would not elaborate.

Commandant of Cadets Brig. Gen. Sylvanus Taco Gilbert speaks during an interview in his office at Air Force Academy near Colorado Springs, Colo.. On Tuesday, Air Force leaders told senators that Gilbert was one of four top school officials who would be replaced because of a sexual assault scandal.

A congressional source said the four who will be replaced are Brig. Gen. S. Taco Gilbert III, the commandant of cadets and second in charge at the academy; Col. Steve Eddy, vice superintendent; Col. Bob Eskridge, vice commander, and Col. Sue Slavec, training group commander and the highest-ranking woman at the academy.

Lt. Gen. John R. Dallager is expected to remain as superintendent and the top official at the 4,100-cadet institution until his scheduled retirement in June.

Gilbert, who declined to comment, is scheduled to leave the academy this summer after completing a standard two-year tour.

According to Rep. Joel Hefley, R-Colo., other changes will include clustering together female cadets’ dormitory rooms and providing round-the-clock security; training medical personnel how to respond to sexual assault cases; giving amnesty to people raising allegations of sexual assault; allowing only juniors and seniors at the academy to discipline freshmen; and expelling any cadet found to provide alcohol to an underage cadet.