it's a school. you pass the school you get the tab. like airborne or air assault but instead of teaching how to slide down ropes or jump out of airplanes it's an advanced certification in infantry operations up to the company level. you have to have the tab to stay in a ranger battalion but just having the tab doesn't guarantee you're scouted for ranger battalion... just like having the airborn certification doesn't guarantee you go to an airborne unit.   the major difference is the navey refuses to lower the standards for seals which is why it's open to woman but no woman has ever passed. the reason is rangers are the ass end of special forces and are barely sf to begin with.
Pirate