The Stratofortress is a campaign-exclusive support power that used by United States. It can call a Stratofortress bomber to bombard the designated area. It is the predecessor of the Harbinger, an aircraft the Americans could not finish, until the Foehn Revolt did.[1]
This situation calls for the deployment of our Stratofortress. It might not be enough to destroy the Amplifier, but it will definitely deal great damage to the Soviet forces. It is unfortunate we have never finished its successor, but we hope it aids you well.
The trailer shows that the Stratofortress bombs were able to destroy buildings in one bombing run. In-game however, this is not the case, as the Stratofortress bombs' effectiveness against structures is reduced significantly.
The trailer also shows more than one Stratofortress. In-game, only one Stratofortress bomber can be summoned at a time.