After Pakistan declared independence in 1947, it remained a Constitutional Monarchy of the British Empire for roughly 9 years before it became a republic in 1956.
Resultantly, the Airforce was officially known as the Royal Pakistan Air Force (RPAF) back then and had a bit different roundels and markings than it has today.
60 years later, the airforce has stopped using them but the Pakistan Navy's Naval Air Arm has started to use the same markings on their helicopters and aircrafts. Even though we have the modern PAF roundel in-game, it will be very cool to have these too for historical accuracy