The practice serves to cultivate a group-oriented environment through the process of removing exterior signs of individuality. In many militaries head-shaving is mandatory for males when beginning their training. However, even after the initial recruitment phase, when head-shaving is no longer required, many soldiers maintain a completely or partially shaven hairstyle (such as a "high and tight", "flattop" or "buzz cut") for personal convenience and an exterior symbol of military solidarity. Head-shaving is not required and is often not allowed of females in military service, although they must have their hair cut or tied to regulation length.