"A Book should serve as the Ax for the frozen sea within us."-- KAFKA
Probably just a secret Brazilian Air Force proto-type. The country has an advanced weaponry program created by Cloned Nazi Scientists or CNSs, as we call them here.
I must admit the color scheme is very reminiscent of the classic olive drab of US Armored Forces. My guess is it's the new prototype Anti-Grav Assault Sled. G.E.V., anyone?