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Rep. Michael R. Turner, Ohio Republican, and Sen. Kirsten E. Gillibrand, New York Democrat, are drawing up legislation that likely will be included in the annual defense policy bill that essentially will strip military officers of the authority to overturn convictions for serious offenses such as sexual assault.

Separately Mrs. Murray and Sen. Kelly Ayotte, New Hampshire Republican, introduced legislation on Tuesday to provide victims with a special military lawyer who would assist them throughout the process, prohibit sexual contact between instructors and trainees during and within 30 days of completion of basic training or its equivalent, and ensure that sexual assault response coordinators are available to help members of the National Guard and reserve.

“We have learned of an increase in the amount of service members experiencing unwanted sexual contact and a decrease in the rate that those incidents are reported,” Mr. Turner said. “The exact opposite direction of what would indicate a cultural and statistical shift on a problem that affects mission readiness and overall morale of our forces,” he said in a statement. “It’s clear much more needs to be done both legislatively and structurally, to root out this problem.”

According to Pentagon documents, the key conclusion of the report is that “sexual assault is a persistent problem in the military and remains vastly underreported.”

The report says that of the 1.4 million active-duty personnel, 6.1 percent of active-duty women — or 12,100 — say they experienced unwanted sexual contact in 2012, a sharp increase over the 8,600 who said that in 2010. For men, the number increased from 10,700 to 13,900. A majority of the offenders were military members or Defense Department civilians or contractors, the report said.

Gen. Mark A. Welsh III, the Air Force’s chief of staff, told the Senate Armed Services Committee that he and Air Force Secretary Michael B. Donley were “appalled” by the charges against Krusinki.

“As we have both said over and over and over again, sexual assault prevention and response efforts are critically important to us,” Gen. Welsh said. “It is unacceptable that this occurs anywhere, at any time, in our Air Force.”

Gen. Welsh said that while the Krusinski case is being adjudicated by the Arlington County prosecutor, the Air Force has requested jurisdiction. He said that Col. Krusinski will be arraigned Thursday on one count of sexual battery and that an Arlington County prosecutor will decide the jurisdiction question.

Sen. Claire McCaskill, Missouri Democrat, who is one of the most vocal critics of the military’s efforts to stop sexual assaults, pressed Gen. Welsh on what qualifications Col. Krusinski had for the job and whether Gen. Welsh had reviewed his personnel file since his arrest to see if there were any red flags.

Gen. Welsh said he found nothing irregular in Col. Krusinski’s file.

• Associated Press writer Richard Lardner contributed to this article.