I'm not showing it under the list of technologies as an option to research. But as I just clicked on Rocket Silo, it's showing up as a recipe gained from researching the Rocket Silo. Putting it as a separate research may make it easier to find and know when you will have access to it.

I've got this mod downloaded, but it's not showing up under any research. Any ideas? Any other mods that could possibly hide it?