I did read an article today about a guy describing conditions in long term troop transport vehicle missions. He said that during the battle of Baghdad he and his unit were crammed into transports for 12-14 hours at a time that didn't stop for bathroom breaks, and you had guys peeing into bottles and defecating into used MRE bags, often by troops who had dysentery. He wondered how women and men would react to that situation in a mixed sex unit.
The Israelis have women in combat, so that's a plus.
I believe the Israelis have not had women in combat units defined as front line infantry, not fighter pilots since 1948. What they found out is that the Arab opponent would fight to the death if aware they were fighting against women, otherwise they would accept surrendering.