At one of the Heritage meetings, Graham said there was a serious problem for the Excalibur concept. He noted that if the Soviets launched a missile at the satellite, the US had only two choicesthey could allow the missile to hit Excalibur and destroy it, or it could defend itself by shooting down the missile, which would also destroy Excalibur. In either case, a single missile would destroy the station, which invalidated the entire concept of the system in terms of having a single weapon that would destroy a large portion of the Soviet fleet.