TRUE POLAR WANDER OF TERRESTRIAL PLANETS AND ITS IMPLICATIONS FOR THE LONG-TERM STABILITY OF POLAR VOLATILESTHE COLD PERMANENTLY SHADOWED POLAR REGIONS OF THE MOON AND MERCURY POSSESS SUBSTANTIAL RESERVOIRS OF NEARSURFACEWATER ICE. DESPITE TWENTY YEARS OF STUDY FROM A COMBINATION OF SPACECRAFT (LUNAR PROSPECTOR LRO LCROSS MESSENGER ETC.) AND GROUND-BASED FACILITIES THE EXACT ORIGIN AND NATURE OF THESE POLAR DEPOSITS REMAIN UNKNOWN. IN PARTICULAR IT IS UNCERTAIN WHETHER THESE DEPOSITS REPRESENT ANCIENT POSSIBLY PRISTINE REMNANTS OF EARLY ASTEROIDAL AND COMETARY IMPACTS OR IF THEY ARE BEINGCONTINUALLY REPLENISHED THROUGH BOMBARDMENT OF WATER-RICH MICROMETEOROIDS AND IMPLANTATION OF HYDROGEN FROM THE SOLAR WIND. FOR THESE DEPOSITS TO BE ANCIENT THE PRESENT-DAY SPIN STATE OF THESE BODIES MUST NOT HAVE CHANGED SIGNIFICANTLY OTHERWISE PRESENT PERMANENTLY SHADOWED REGIONS WOULD BE EXPOSED TO SUNLIGHT AND SUBLIMATE ANY WATER. HOWEVER MANY GEOLOGIC PROCESSES CAN ALTER THESPIN STATES OF PLANETARY BODIES. THE FORMATION OF IMPACT BASINS FLOOD VOLCANISM AND MANTLE PLUMES CAN ALTER THE PLANETS MOMENTS OF INERTIA RESULTING IN TRUE POLAR WANDER (TPW; REORIENTATION OF THE SPIN AXIS RELATIVE TO SURFACE GEOGRAPHY). THESE PROCESSES CAN ALSO AFFECT THE OBLIQUITY EVOLUTION OF THESE BODIES WHICH HAS SIGNIFICANT IMPLICATIONS FOR STABILITY OF POLAR WATER. THE PRIMARY GOAL OF THIS PROPOSED WORK IS TO IMPROVE OUR UNDERSTANDING OF THE SPIN STATE EVOLUTION OF THE MOON AND MERCURY AND TO DIRECTLY CONSTRAIN THE AGE (AND THUS NATURE) OF POLAR ICE ON THESE BODIES.