Menstrual control nanites were microscopic robots used to control the menstrual circle of female humans. The count had to be refreshed with infusions twice a year. Unlike the Royal Manticoran Navy, the Grayson Space Navy did not stock the nanites as of 1921 PD, because women only recently, and in small numbers, began to serve in the military. Ensign Cecelie Rustin asked for a stock of the devices when beginning her service aboard the destroyer GNS Manasseh, and the CMO put in an order. (GNLH)