On January 10, 2015, SpaceX launched a Falcon 9 rocket that successfully put a Dragon spacecraft in orbit. This was SpaceX's fifth commercial resupply mission (CRS-5) to the International Space Station.The SpX-5 mission marked the first flight for a Polar unit.
polarTwo Polar units and one GLACIER unit was launched on the Dragon. One Polar unit launched powered at a set point temperature of -35°C, transporting science samples to the ISS. The other Polar unit launched in soft stowage and will be returning on SpX-5 with science samples from the ISS. The GLACIER unit launched powered with science samples and will remain on ISS. During docked operations, there will be ten powered units on the ISS; 3 MERLINs, 5 GLACIERs, and 2 Polars.Two Polar units and one MERLIN unit are planned to launch on SpaceX’s sixth commercial resupply mission to ISS, SpX-6.