Lt. Gen. Michelle Johnson, superintendent of the Air Force Academy and first woman to hold the post, said she was encouraged, but more work must be done.

A report about sexual assaults at the three major academies released by the Defense Department said a total of 70 incidents were reported in the 2012-13 school year, down from 80 the year before. But a decade after a sexual assault scandal at the Air Force Academy outside Colorado Springs, the review found a culture of disrespect pervades the three schools and their sports teams.

The Air Force Academy accounted for 45 of the 2012-13 reports, including seven incidents that happened before the victim became a cadet.

“We remain encouraged by the reporting numbers because we believe it reflects victim confidence in our program,” Johnson said in a statement. She did not directly address why reports were higher at the Air Force school than the other academies.

The report said students at the three schools often believe they have to put up with sexist behavior. It said an old slide presentation that disparaged women was circulated by members of two sports teams at the Air Force Academy. The report did not identify the teams or offer any other information.

An academy spokesman said he could not immediately provide any details.