As it moves toward gender-integrated training, the US Marine Corps is retiring a historic training battalion at Parris Island, making an all-female battalion superfluous. 

The US Marine Corps is deactivating the 4th Recruit Training Battalion at Parris Island, which has trained female Marines since 1986. The move signifies that the Corps is making progress towards integrating men and women into a single training pipeline at its iconic training base. The Corps stated that successful recruit training standardization now makes an all-female training battalion unnecessary, as all recruits have been training in gender-integrated companies since 2022. Marine Corps Recruit Depot Parris Island in South Carolina has trained recruits for over 100 years and holds a special place in the Corps. Since 1949, it was the sole base for Marine Corps basic training of male recruits east of the Mississippi River. The deactivation ceremony for the 4th Recruit Training Battalion is scheduled for June 15, 2023. 

Source: https://www.military.com/daily-news/2023/05/03/historic-female-unit-will-be-deactivated-marine-corps-continues-integrating-force.html