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Hank Pym developed Pym Particles in the 1970s as a method of shrinking and growing. Pym would later utilize Pym Particles in a suit, later dubbed the Ant-Man suit. The Ant-Man suit would also be equipped with an EMP Communication Device, allowing communication between the wearer and ants.
The Ant-Man suit would be used on various missions, including a mission in East Berlin involving radicals involved with Hydra. The suit would sustain heavy damage, although it couldn't reach subatomic sizes, a detail that would result in Janet van Dyne being stuck in the Quantum Realm trying to stop a Soviet missile. The incident caused Pym to give up the mantle of the Ant-Man.