USA-206
It was the twenty-first and last Block IIR GPS satellite to be launched and the eighth to use the modernized IIRM configuration.[3] Following separation from its carrier rocket, GPS IIR-21 received its USA designation, USA-206.It was deployed into a transfer orbit, from which raised itself to a semi-synchronous medium Earth orbit on 19 August, using an onboard Star 37FM apogee motor.It is a 2,032-kilogram (4,480 lb) satellite,[1] and is expected to operate for at least ten years.[3] Once it had completed on-orbit testing, it began covering Slot 3 of Plane E of the GPS constellation, replacing USA-126, or GPS IIA-26, which was launched in July 1996.