 The Joint Systems Manufacturing Center in Lima , in cooperation with General Dynamics , assembles armored combat vehicles , including the Expeditionary Fighting Vehicle and M1A2 Abrams tank . Columbus @-@ based Zyvex Performance Materials develops the Piranha Unmanned Surface Vessel . Gravitational Energy Corporation , located in Cuyahoga Falls , proliferates Gravity Assisted Power ( GAP ) machines in cooperation with <unk> , LLC to the military . 
