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There are SP Anti Air and SP Artillery units and PTS Laser Canon/PTS Meson Canon and PTS Missile Launcher units.

I think PTS stands for planet-to-space.
This question / problem has been solved by Luxor70image
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Fengol: There are SP Anti Air and SP Artillery units and PTS Laser Canon/PTS Meson Canon and PTS Missile Launcher units.

I think PTS stands for planet-to-space.
SP stands for Self-Propelled and PTS planet to space :-)
Thank you!