Officially known as the Variable Threat Response Battle Suit, this armor was created initially by Stark to deal with the Masters of Silence threat by using a "respond in kind" philosophy and strategy. It was designed for all-out warfare and was Stark's experiment with laser guided munitions and ballistic weaponry. Since the Masters of Silence were protected against Iron Man's usual weaponry of repulsors and unibeam, those weapons were removed from the Mark I model. The armor included several response devices such as a shoulder mounted electric minigun, shoulder mounted missile box launcher, and wrist mounted gauntlet cannons with additional weaponry such as a laser blade and flamethrower. It was not collapsible, and included far heavier carbon-composite-based armor as well as improved tactical computer systems and automatic targeting. A later version, Mark II Model JRXL-1000, was designed and built for James Rhodes, which became a full-fledged superhero identity for him as War Machine. In Mark I model, both the double-barreled cannon and the plasma blade were fixed with the flamethrower built over the plasma blade casing. In Rhodes' Mark II model, the wrist weapons became modular and the armor also included repulsor and unibeam technology. In both iterations, the shoulder mounted weapons are modular and can be removed and replaced. All further incarnations of the armor were used by Rhodes.