Orbital Test Bed (OTB): Launched 2019

The ESPA class platorm for the Orbital Test Bed (OTB) satellite was designed and manufactured by SSTL before being shipped to the US for testing and payload integration at SSTL's US office in Denver, Colarado which was acquired by General Atomics Electromagnetic Systems Group in 2017.  OTB carries five demonstration payloads including NASA's Deep Space Atomic Clock, for a variety of commercial, US government, and academic organisations.