it's test pilot jargon and also an old experimental porno
https://en.wikipedia.org/wiki/Behind_the_Green_Door
rare earth coming home:
Lynas Corp., an Australian rare-earths processor, and Blue Line Corp., a chemical company which is already based in Texas, agreed to a partnership to "see that US companies have continued access to rare-earth products by offering a US-based source."
https://arstechnica.com/information-technology/2019/05/australian-rare-earth-ore-processor-wants-to-build-a-plant-in-the-us/