AND THEN THERE WAS ZENITH STAR
2 MW continuous wave infrared(?) space-based laser.
Forms the backbone of Gallo-Varnian orbital defense network protecting against ASATs and high altitude TBMs. Its primary mission is offensive though, since it is intended to destroy communications and GNSS satellites during wartime, freeing aircraft, warships, and other terrestrial based launchers from that role.
First three pairs of Block 1 SIVs deployed between 2012-2015. The Zenith Star constellation became IOC with the Gallan Space Command in 2016 and Varnian Navy in 2015. Block 2 SIVs will feature a protective housing for the mirror face, a new mirror assembly with a separate optical targeting system, and improved electronics over the 1980s-vintage of the Block 1s, with initial launches planned for 2019-2020. The Block 2 SIVs will be deployed two at a time in a SLV, because they comprise only the front portion of the spacecraft.
Countermeasures include aforementioned ~battle laser~, infrared decoys, chaff, and a substantial maneuvering capability. Future countermeasures will probably be a constellation of DSATs/suicide satellites for self-protection, and radar decoys, but that's not expected until the mid-2030s.
The Gallan Celestial Control Command Computer uses a quartet of Gala-2 supercomputers to process radar information, using the Royal Gallan Navy's Kvikkalkul computer language as the basis. The Varnian Navy equivalent uses a rack of COTS Gallan Business Machines Sail servers, running a militarized version of the GBM Blue Cap operating system.