Silent Running (Fallout: New Vegas)

Silent Running is a perk

Effects

 * With this perk, running no longer factors into a successful sneak attempt.
 * Melee or unarmed fighters that rely on sneak attack criticals can also benefit from the perk alongside Travel Light, Implant M-5 and Tunnel Runner, allowing one to close the distance quickly while remaining silent to achieve a Sneak Attack Critical.

Behind the scenes
The perk is a reference to the 1972 film Silent Running, which was set against a post-apocalyptic sci-fi backdrop.