 The "First Chip" aircraft were renamed "Rivet Chip" and the "Second Slice" as "Rivet Slice".The production aircraft were further modified with new TF33-P-11A engines that delivered even greater thrust than those of the prototypes.Foil systems developed in 1962 for the WC-130B to collect particulate debris from nuclear tests were installed in the bomb bay and the fuselage beside the cockpit.