The vertibird bomb is a quest item in Fallout: New Vegas.
Characteristics
It is a bomb used to sabotage Bear Force One in order to kill President Kimball after his speech at Hoover Dam during the quest Arizona Killer. Conversely, during the quest You'll Know It When It Happens, it is found planted on the vertibird and can be disarmed.
Location
During the quest Arizona Killer, it is given to the player character by Cato Hostilius as one of the means, by which to assassinate the president.