Important milestones in the history of USP can include its establishment in 1926, the introduction of the Federal Public Service Commission in 1935, and the first civil services examination conducted in 1929. Other significant events include the inclusion of women in the examination in 1972, the introduction of the online application system in the 21st century, and various reforms over time to enhance transparency and accessibility. These milestones reflect the evolution of UPSC and its commitment to producing efficient civil servants for the nation.