Presidential Vertibird

 is New California Republic President Aaron Kimball’s personal vertibird.

Characteristics
This is a unique Vertibird used by the NCR to transport president Aaron Kimball, presumably repurposed after the destruction of the Enclave oil rig. It only appears during the quests You'll Know It When It Happens and Arizona Killer. Before the President's speech the player can see it behind a hill near Hoover Dam by standing on one of the towers. Shooting at the Vertibird will result in being shot at by nearby NCR troopers. Painted on the side of Bear Force One is the NCR bear logo. This Vertibird is the same model as the ones in Fallout 3 but instead is a dark green color.

Quests
You'll Know It When It Happens: Search the vertibird for anything that might endanger the president.

Trivia

 * It is very fragile for a presidential transport as it can be brought down fairly easily (1 shot from an Anti-Materiel Rifle)
 * If you activate the Vertibird before the engineer goes near it it will come up with 'This is the President's vertibird'

Behind the Scenes
Bear Force One is a pun reference to the U.S. Presidential airplane, Air Force One and that the symbol of the NCR is a two headed Bear.