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A roll program or tilt maneuver is an aerodynamic maneuver that alters the attitude of a vertically launched space launch vehicle. The maneuver is used to place the spacecraft on a proper heading toward its intended orbit. It often consists of a partial rotation around the vehicle's vertical axis followed by tilting the vehicle to follow the proper gravity turn and/or to improve aerodynamics.
A roll program is completed shortly after the vehicle clears the tower. In the case of a crewed mission, a crew member reports the roll to the mission control center which is then acknowledged by the capsule communicator.
Aerodynamic maneuver