This is a drawing in ink and color pencil on drafting paper, somewhat lighter in weight than the Staedtler paper,
and showing its blue "dropout" grid. The color was chosen because it was transparent to diazo (i.e. blueprint) machines,
and so wouldn't show up on blueprints of the drawings done on it. You may notice a striking similarity to our friend
Colonel Havok, whom we met earlier. Maybe his daughter? Infantry material. 1/2 of a folded 11x17 in. sheet.