Even more, work started on a more advanced Stealth Boy mark II prototype. In fact, it was enough to convince the military to have had these devices mass produced. The technology wasn't perfect, but proven itself reliable enough for military purposes. Robert Mayflower, the man responsible for creating Stealth Boys under RobCo's aegis, reverse-engineered captured Chinese Hēi Guǐ stealth armor.

The underlying principle of bending light to create invisibility wasn't invented by the Americans.

The end result is practical invisibility, which can range from translucency to near-perfect active camouflage. One of the most interesting technologies developed before the war, the Stealth Boy 3001 is a wrist-mounted device that generates a modulating field that transmits the reflected light from one side of an object to another (called stealth radiation ). The following section is transcluded from Stealth Boy.