There's a possible place in Ranger or SF units for some women, but it'd be for a very few- less than one in a hundred- just as Rangers and SF hardly represent the average grunt, either. And SDOD-Delta has had female *friends* who help make their penetrations more effective; *everybody knows* the USA doesn't have any female SF operators, right?
But I really think the most likely place for female soldiers in combat would be in armor. Aside from the loader's position duties, there's a minimum of strength, particularly upper body strength required for being a tank crewman- and an automatic loader could take care of such requirements in that respect, in future tank designs if not in today's Abrams.
Women are turning out to be pretty decent F16 and A10 pilots- even the Israelis have a female F16 driver now- and a few could surely be found who could handle the driver's and gunner's jobs in a tank. Though the thought of an idiot female 2nd Lieutenant tank platoon scares me to death, the same is just as frightening when considering some such male counterparts. But I'd bet it could be made to happen more effectively in Armor than in Infantry, Artillery, or the Combat Engineers.
Although the Soviets and NVA made use of female snipers. And I always found it easier to teach a woman to shoot than a man...lol.