Report to other governments the allocation and distribution of government steel purchasing, and thereby provide estimates for the production and maintenance of warships, subs, tanks, and other vehicles.
Most of it is publicly available, and what isn't can be estimated reliably via satellite imaging
Like, most of those tanks are just sitting out in the desert, in full view of global satellites.
YOU can collect that information for like a thousand bucks, by buying satellite imagery. People are doing that right now.