CLOUDS REMAIN AS A MAJOR SOURCE OF UNCERTAINTY IN CLIMATE MODELS. ICE CLOUDS IN PARTICULAR ARE POORLY CONSTRAINED AND HAVE BEEN USED AS A TUNING PARAMETER IN THE MODELS TO BALANCE RADIATION BUDGET AT THE TOP OF ATMOSPHERE AND PRECIPITATION AT THE SURFACE. LACK OF ACCURATE CLOUD ICE AND ITS MICROPHYSICAL PROPERTY MEASUREMENTS HAS LED TO LARGE UNCERTAINTY ABOUT GLOBAL CLOUDS AND THEIR PROCESSES WITHIN THE ATMOSPHERE. NASA S AEROSOL CLOUD AND ECOSYSTEMS (ACE) AN EARTH SCIENCE DECADAL SURVEY (DS) MISSION RECOMMENDED AN ADVANCED SCIENCE PAYLOAD WITH SUBMM- WAVE AND LONGWAVE INFRARED (LWIR) RADIOMETERS FOR SUCH CLOUD ICE MEASUREMENT. IN A RECENT COMMUNITY WHITE PAPER CLOUD AND PRECIPITATION PROCESS MEASUREMENTS (CAPPM) DYNAMICS AND MICROPHYSICAL PROPERTIES ARE IDENTIFIED AS THE KEY LINKS BETWEEN THE CLOUD-PRECIPITATION PRO- CESSES AND NEED MORE ACCURATE MEASUREMENTS.