The latest set of Iridium NEXT satellites have arrived at Vandenberg Air Force Base in preparation for the Iridium NEXT-5 launch at the end of this month. They will be launched on a Falcon 9 booster that is familiar with the mission requirements, having previously launched the Iridium NEXT-3 mission.
https://www.nasaspaceflight.com/2018/03/satellites-fifth-iridium-next-launch-arrive-vandenberg/