It consisted of four experiments: Return Flux Experiment (REFLEX) to test accuracy of computer models predicting spacecraft exposure to contamination; Global Positioning System Attitude Determination and Control Experiment (GADACS) to demonstrate GPS technology in space; Solar Exposure to Laser Ordnance Device (SELODE) to test laser ordnance devices; Spartan Packet Radio Experiment (SPRE) and the Amateur Radio Association at the University of Maryland (W3EAX) amateur radio communications experiment.