(Telecompaper) Iridium Communications announced that SpaceX successfully launched the fourth set of 10 Iridium Next satellites into orbit from Vandenberg Air Force Base in California on 23 December. The launch marks the midway point of the Iridium Next launch programme, and was the first Iridium launch to use a SpaceX flight-proven rocket. The first stage booster for Iridium-4 was previously used for Iridium-2, making Iridium the first company to reuse the same rocket booster.