WASHINGTON >> President Joe Biden signed an executive order on Friday giving decisions on the prosecution of serious military crimes, including sexual assault, to independent military attorneys, taking that power away from victims’ commanders.

The order formally implements legislation passed by Congress in 2022 aimed at strengthening protections for service members, who were often at the mercy of their commanders to decide whether to take their assault claims seriously.

Members of Congress, frustrated with the growing number of sexual assaults in the military, fought with defense leaders for several years over the issue. They argued that commanders at times were willing to ignore charges or incidents in their units to protect those accused of offenses and that using independent lawyers would beef up prosecutions. Military leaders balked, saying it could erode commanders’ authority.

Sen. Kirsten Gillibrand of New York spent about a decade in an uphill battle to reform how the military handles sexual assaults and get the legislative changes passed that were codified through Biden’s order.

“While it will take time to see the results of these changes, these measures will instill more trust, professionalism, and confidence in the system,” Gillibrand said.

The change was among more than two dozen recommendations made in 2021 by an independent review commission on sexual assault in the military that was set up by Defense Secretary Lloyd Austin. And it was included in the annual defense bill last year. But since it requires a change to the Uniform Code of Military Justice, it needed formal presidential action.

In a call with reporters previewing the order, senior Biden administration officials said it was the most sweeping change to the military legal code since it was created in 1950.

The changes come as the military grapples with rising numbers of reported sexual assaults in its ranks.