WASHINGTON - Women may be able to start training as US Army Rangers by mid-2015 and as Navy commandos a year later under plans set to be announced by the Pentagon that would slowly bring women into thousands of combat jobs, including those in elite special operations forces.

They call for requiring women and men to meet the same physical and mental standards to qualify for certain infantry, armor, commando and other front-line positions across the Army, Navy, Air Force and Marines. Defense Secretary Chuck Hagel reviewed the plans and has ordered the services to move ahead.

The move, expected to be announced Tuesday, follows revelations of a startling number of sexual assaults in the armed forces. Earlier this year, Joint Chiefs of Staff Chairman Gen. Martin Dempsey said the sexual assaults might be linked to the longstanding ban on women serving in combat because the disparity between the roles of men and women creates separate classes of personnel - male "warriors" versus the rest of the force.

While the sexual assault problem is more complicated than that, he said, the disparity has created a psychology that lends itself to disrespect for women.

Under the schedules military leaders delivered to Hagel, the Army will develop standards by July 2015 to allow women to train and potentially serve as Rangers, and qualified women could begin training as Navy commandos by March 2016 if senior leaders agree. Military leaders have suggested bringing senior women from the officer and enlisted ranks into special forces units first to ensure that younger, lower-ranking women have a support system to help them get through the transition.

The Navy intends to open up its Riverine force and begin training women next month, with the goal of assigning women to the units by October. While not part of the special operations forces, the coastal Riverine squadrons do close combat and security operations in small boats.  The Navy plans to have studies finished by July 2014 on allowing women to serve as commandos, known as  SEALs, and has set October 2015 as the date when women could begin Navy boot camp with the expressed intention of becoming SEALs eventually.

US Special Operations Command is coordinating the matter of what commando jobs could be opened to women, what exceptions might be requested and when the transition would take place.

The proposals leave the door open for continued exclusion of women from some jobs, if research and testing find that women could not be successful in sufficient numbers, but the services would have to defend such decisions to top Pentagon leaders.

Army officials plan to complete gender-neutral standards for the Ranger course by July 2015. Army Rangers are one of the service's special operations units, but many soldiers who go through Ranger training and wear the coveted tab on their shoulders never actually serve in the 75th Ranger Regiment. To be considered a true Ranger, soldiers must serve in the regiment.

In January, then-Defense Secretary Leon Panetta and Dempsey signed an order that wiped away generations of limits on where and how women could fight for their country. At the time, they asked the services to develop plans to set the change in motion.

The decision reflects a reality driven home by the wars in Iraq and Afghanistan, where battle lines were blurred and women were propelled into jobs as medics, military police and intelligence officers that were sometimes attached, but not formally assigned, to battalions. So, even though a woman could not serve officially as a battalion infantryman going out on patrol, she could fly a helicopter supporting the unit or be part of a team supplying medical aid if troops were injured.

Of the more than 6,700 US service members who have been killed in Iraq and Afghanistan, about 150 have been women.

The order Panetta and Dempsey signed prohibits physical standards from being lowered simply to allow women to qualify for jobs closer to the battlefront. But the services are methodically reviewing and revising the standards for many jobs, including strength and stamina, in order to set minimum requirements for troops to meet regardless of their sex.

The military services are also working to determine the cost of opening certain jobs to women, particularly aboard a variety of Navy ships, including certain submarines, frigates, mine warfare and other smaller warships. Dozens of ships do not have adequate berthing or facilities for women to meet privacy needs, and would require design and construction changes.