2 articles about Valkyrie
The subject by its numbers · The Structure
A 4 by its name: builder & organizer, and therefore the structure.
What the 4 brings is foundation. The reference files it as a structure. Whatever else this section is doing, it is doing it with the 4's insistence that what lasts must be built patiently.
The Structure — schedules, formats, volumes, and the frames that hold everything up →Part 18: The Unforgiving Geometry of Steel: Mecha Animation and the Specialists Who Mastered It
Part 218: The Other Mecha: Beyond Gundam's Shadow, A Numerological Reading of Macross, Patlabor, and Escaflowne