When I went through Paris Island, there was a large platoon of drop outs and none of them were women (at least not noticeably so) They were held there until discharged. This was early 1951.
Not sure what it is today but back then, a 50% dropout rate was not unusual in Marine Corps boot camp. So even among men, the bar was set quite high.
I remember the platoon of wash-outs. It would usually take a week or two to process them out so they had to have somewhere to go in the meantime. I think they spent most of the day picking up cigarette butts on the parade decks and such.
They also had PCP and CCP platoons. The PCP platoon was where you went if you failed a PFP (Physical Fitness Test) and you had 4-6 weeks to get in shape or you were washed out for good.
The CCP platoon was correctional custody for those who tried deserting or had discipline issues. You did not want to be there! I used to pull guard duty in those barracks (as they were not allowed to guard themselves) and they would have them completely disassemble their racks (beds) each morning and stack them up against a wall. They would then have to completely re-assemble them at night after a day of mostly hard labor.