Final answer:
Bans on women in military service were gradually lifted, starting with non-combat roles in World War II and progressing to the lifting of the ban on transgender individuals serving in the armed forces in 2015 which was solidified in early 2021 by the Biden administration.
Step-by-step explanation:
The bans on women entering the security forces were lifted at different times for different aspects of service. During World War II, the necessity of war and activism by women led to the creation of the Women's Auxiliary Army Corps (WAAC) and the Women Accepted for Voluntary Emergency Service (WAVES) in 1942, allowing women to serve in noncombat positions. Moving forward, it was not until the Obama administration in 2015 that a pentagon-commissioned study helped lift the ban on transgender individuals serving in the armed forces, which marked a significant step towards inclusivity in military service. After some back-and-forth with policy reinstatements and restrictions under different administrations, the Biden administration in early 2021 announced that there would no longer be restrictions on military service by transgender individuals.