Performance of the Cosmic Ray Energetics and Mass Instrument for the International Space Station (ISS-CREAM)*

The Cosmic Ray Energetics and Mass Instrument for the International Space Station (ISS-CREAM) was built by an international collaboration from the US, Republic of Korea, France, and Mexico. The scientific objective of the program is to measure the elemental spectra of cosmic rays from Z=1 to Z=26 over the energy range of 10$^{12}$-10$^{15}$ eV. The instrument was installed on the international space station on August 22, 2017 with operations terminated on February 12, 2019 resulting in approximately 1.5 years of operation. In this talk, we discuss the performance of the instrument and detectors during its period of operation. We will compare GEANT-4 simulations to instrument data, demonstrate how we determine the appropriate energy scale for the instrument, and show some preliminary results.