Machine Head

Machine Head is a challenge perk in Fallout: New Vegas. It is given for completing the Demise of the Machines challenge.

Requirements
The Courier must kill 50 robots for one rank each time, three times.

Effects
The player character gains a bonus damage against robots (Mister Gutsy, robobrain, Protectron etc...)
 * Rank 1: +3% damage
 * Rank 2: +6% damage
 * Rank 3: +10% damage

Bugs
Although there are 3 ranks for this perk, a bug in the reward script makes it impossible to get the third rank. The same bug also causes the notification to misreport the rank that is given. When rank 1 is given, the notification says that you've been given rank 2, and when rank 2 is given, the notification says that you've been given rank 3.