What would be the proper grey for a Thunderbolt II. The Hobby Boss kit gives only the greencamo.
You mean these colors?
If you’re asking about the latest 2 tone scheme it’s Light Ghost Grey and Dark Ghost Grey with the false canopy on the bottom done in Gunship Grey
Just be sure to check different photos for reference. There are A-10C’s stationed here in Boise, ID and I have seen a few of them that you can hardly tell that there is two different greys used on the main fuselage and engines. Others the difference is very subtle.