Pentagon officials could not explain the jump in assaults of women, although they believed that more victims, both men and women, were making the choice to come forward. In the general population, about 0.2 percent of American women over age 12 were victims of sexual assault in 2010, the most recent year for which data is available, according to the Justice Department’s Bureau of Justice Statistics.

In response to the report, Mr. Hagel said at a news conference on Tuesday that the Pentagon was instituting a new plan that orders the service chiefs to incorporate sexual assault programs into their commands.

“What’s going on is just not acceptable,” Mr. Hagel said. “We will get control of this.”

The report quickly caught fire on Capitol Hill, where women on the Senate Armed Services Committee expressed outrage at two Air Force officers who suggested that they were making progress in ending the problem in their branch.

“If the man in charge for the Air Force in preventing sexual assaults is being alleged to have committed a sexual assault this weekend,” said Senator Kirsten Gillibrand, Democrat of New York, “obviously there’s a failing in training and understanding of what sexual assault is, and how corrosive and damaging it is to good order and discipline.”

Ms. Gillibrand, who nearly shouted as she addressed Michael B. Donley, the secretary of the Air Force, said that the continued pattern of sexual assault was “undermining the credibility of the greatest military force in the world.”

She and some other members of the committee are seeking to have all sex offenders in the military discharged from service, and she would like to replace the current system of adjudicating sexual assault by taking it outside the chain of command. She is particularly focused on decisions, including one made recently by an Air Force senior officer, to reverse guilty verdicts in sexual assault cases with little explanation.

Senator Claire McCaskill, a Missouri Democrat who is also on the Senate Armed Services Committee, is holding up the nomination of that Air Force officer, Lt. Gen. Susan J. Helms, to be vice commander of the Air Force’s Space Command. Ms. McCaskill said she wanted additional information about General Helms’s decision to overturn a jury conviction in a sexual assault case last year.