It is colored Orange and Blue because of it's special stealth system that lets it blend into it's environment, like a Chameleon.
Iron Man 3
The suit was created after the New York battle. Tony realized that there couldn't be one suit that could do anything, so he started building suits specializing in certain areas, like Stealth. Disco was placed into the Hall of Armor along with the rest of the Iron Legion. When the "House Party Protocol" was ordered, it and the rest of the Iron Legion flew to assist Tony in the Extremis battle. During the battle two Extremis soldiers tried to throw bars at it, but it turned around and blasted them. It was either destroyed by the "Clean Slate Protocol" or the Extremis soldiers.
|Iron Man armors|
|Primary Armors||Mark I | Mark II | Mark III | Mark IV | Mark V | Mark VI | Mark VII | Mark XLII|
|Iron Legion||Mark VIII | Mark IX | Mark X | Mark XI | Mark XII | Mark XIII | Mark XIV | Mark XV | Mark XVI | Mark XVII | Mark XVIII | Mark XIX | Mark XX | Mark XXI | Mark XXII | Mark XXIII | Mark XXIV | Mark XXV | Mark XXVI | Mark XXVII | Mark XXVIII | Mark XXIX | Mark XXX | Mark XXXI | Mark XXXII | Mark XXXIII | Mark XXXIV | Mark XXXV | Mark XXXVI | Mark XXXVII | Mark XXXVIII | Mark XXXIX | Mark XL | Mark XLI | Mark XLII|
|War Machine Armors||Mark I | War Machine prototype | Mark II | Iron Patriot|
|Related Armors||Iron Monger | Whiplash (Mark I • Mark II) | Hammer Drones|