Ranger Takedown

 is an unarmed perk in Fallout: New Vegas.

It's acquired by being successful in a speech challenge from Ranger Andy after he tells you about his multiple leg injuries. It can also be acquired by completing an unmarked quest which requires you to check on Ranger Station Charlie and tell him what happened there.

Bugs

 * When you learn the attack after you learn it when you talk to Ranger Andy it will come up again that you learned the Ranger Takedown and it will freeze. (Xbox 360) ✅
 * Prior to patch 1.2.0.31x, learning the Ranger Takedown without Raul Tejada will break the Old School Ghoul quest. This can also be fixed with Console commands in the PC version.