OPS-4
OPS-4 was an unflown Soviet space station, expected to be a fourth in the secret Almaz military program. It remained grounded due to the cancellation of the program.[1]
Spacecraft
OPS-4 underwent several technical and design changes. The aft docking port was designed to receive heavier TKS spacecraft, compared to a lighter Soyuz-enabled docking port in the three previous stations.[1]
It was to be the first station launched with a three panel Mech-A Synthetic Aperture Radar and a manned reusable Return Vehicle VA. The VA was replaced by a second docking port, due to dealys in preparing a crew-rated TKS; the front sencion was refitted with a Soyuz-enabled docking port to receive manned craft.[1]
OPS-4 was to carry an advanced Shchit-2 space-to-space cannon. It was reported to be a two projectile system armed with unguided missiles.[1]
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