Man-Machine Interface

Man-Machine Interface is a three-star (★★★) challenge added in the Fallout: New Vegas add-on Gun Runners' Arsenal.

Obtaining
To complete this challenge, you must kill 10 Mojave Wasteland Mr. Gutsies or sentry bots with brass knuckles, spiked knuckles, tire irons, or lead pipes.

Behind the scenes
The name may be a reference to Masamune Shirow's cyber punk manga series "Ghost in the Shell 2: Man-Machine Interface"