The caterpillar p 5000 powered work loader or power loader is a commercial mechanized exoskeleton used for lifting heavy materials and objects and is heavily employed by the united states colonial marine corps to load ordnance on board their starships power loaders are equipped with hydraulic quotclawsquot that can be used to hold and manipulate a variety of objects perhaps the most famous use of a power loader was when ellen ripley used one in desperation to engage a xenomorph queen i