Luxembourg’s Kleos Space has confirmed that its second satellite cluster, the Polar Vigilance Mission, has completed its integration readiness review and is on course for launch in the middle of this year, as planned. Kleos Space, a data-as-a-service company established to provide radio frequency reconnaissance, will launch four Polar Vigilance nanosatellites atop a SpaceX Falcon 9 rocket once they have passed the assembly and testing phases.