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The Materials on the International Space Station Experiments (MISSE) present a unique opportunity in space science by offering a low-cost platform to expose materials directly to the space environment on the International Space Station (ISS). MISSE experiments consist of a "suitcase" like package known as the "Passive Experiment Carrier" (PEC) that can be carried by astronauts and mounted externally to the ISS. The s"MISSE payload (MISSE-5) contained both passive and active experiments. The Forward Technology Solar Cell Experiment (FTSCE) on MISSE-5 measured current voltage (I-V) characteristics on 36 solar cells of various types. Over 1500 I-V curves were recorded on each cell during a 13-month period. This paper analyses the results for all the III-V multi-junction cells flown, including state-of-the-art space qualified cells and next generation metamorphic cells.