Power Armor was the abbreviation Powered Armor, which was a form of powered exoskeleton, was a mobile machine that consisted of primarily of an outer framework worn by a person, and a powered system of motors or hydraulics that delivers at least part of the energy for limb movement. The most notable use of this type of mecha were the Zentraedi power armors, the Nousjadeul-Ger Mobile Power Armor and Queadluun-Rau Power Armor. Humans also tried developing power armor technology after their discovery of Robotechnology, in the form of the first generation Cyclones. During the Reconstruction Era, power armored suits played a much larger role in construction and helping keep the peace after some private contractors found Zentraedi either too unreliable or violent. The Army of the Southern Cross would later be a heavy adopter of power armor, with many used either in space operations or deep underwater.