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. During You'll Know It When It Happens it is found planted on the Vertibird and can be disarmed.
Location
During Arizona Killer it can be given to you by Cato Hostilius as one of the means to assassinate the president.