Arizona Killer

 is a quest in Fallout: New Vegas.

Quick walkthrough
There are many paths available for the assassination. The direct approach of assaulting or sniping the president easily completes the assignment, but make escape difficult. Speaking to the other assassin (explosives skill 50 required) can provide a bomb to plant on the Vertibird during the speech. The console outside, east of the visitor center door, can be used to either rig the AA cannon to explode (Repair skill 50 required), or shoot the aircraft down as soon as it flies in and is the fastest possible assassination method (Science skill 50 required).