Many women have served in the United States Navy for over a century. Today, there are over 52,391 women serving on active duty in an array of traditional (administrative, medical, etc.) and non-traditional (aviation, combat systems, etc.) ratings or careers. Like their male counterparts, female sailors are expected to adhere to regulations specific to appearance, grooming, and health and fitness; however some differences exist for example in physical fitness tests due to performance and in relation to pregnancy and parenting provisions created to help support military families.