The Hammer Drones were unmanned combat drones created by Ivan Vanko based on Justin Hammer's failed (and admittedly rushed) attempts to create armors based on Tony Stark's Iron Man armor. He changed the design from manned suits to remote-controlled drones, arguing that "People make problem". The individual drones were then customized into separate models for use by various parts of the U.S. military. Though each model has the same basic structure, their armament and exterior designs are different for each branch.