THIS PROPOSAL FOR THE NASA EARTH AND SPACE SCIENCE FELLOWSHIP AIMS TO SUPPORT CALIBRATE AND LAUNCH DEUCE THE DUALCHANNEL EXTREME ULTRAVIOLET CONTINUUM EXPERIMENT. DEUCE IS A SOUNDING ROCKET-BASED INSTRUMENT THAT WILL OBTAIN THE FIRST FLUX CALIBRATED SPECTRA OF TWO NEARBY B STARS IN THE LYMAN CONTINUUM AND FAR UV WITH THE GOAL OF UNDERSTANDING HOT STAR CONTRIBUTION TO REIONIZATION. CURRENT REIONIZATION SIMULATIONS UTILIZE MODELS OF STELLAR IONIZING FLUX OUTPUT AS NO CALIBRATED OBSERVATIONS OF THESE STARS EXIST IN THE HARDEST IONIZING 700-900A BANDPASS. HOWEVER SUCH MODELS HAVE HISTORICALLY PROVEN POOR AT PREDICTING THE IONIZING RADIATION OUTPUT OF THESE STARS. DEUCE IN TANDEM WITH SIGHTLINE MODELLING THAT ALLOWS FOR INTERPRETATION OF ITS OBSERVATIONS WILL PROVIDE THE FIRST FLUX CALIBRATED MEASUREMENTS THAT CAN CONSTRAIN STELLAR MODELS AND ALLOW FOR AN ACCURATE DETERMINATION OF THE IONIZING FLUX OUTPUT OF HOT STARS. DEUCE CONSISTS OF A WOLTER II GRAZING INCIDENCE TELESCOPE FEEDING A TWO CHANNEL HIGH/LOW RESOLUTION ROWLAND CIRCLE SPECTROGRAPH WITH A NOVEL LARGE-FORMAT LOW-NOISE MCP DETECTOR. TESTING OF THIS NEW CLASS OF DETECTOR SUPPORTS THE NESSF'S SPECIFIC ASTROPHYSICS CALL FOR DETECTOR ANALYSIS AND TECHNOLOGY DEVELOPMENT. DEUCE ALSO DIRECTLY ANSWERS OBJECTIVE 1.6 OF THE NASA 2014 STRATEGIC PLAN AND ASTROPHYSICS GOAL 4.4 OF THE NASA 2014 SCIENCE PLAN BOTH OF WHICH CALL FOR RESEARCH INTO HOW GALAXIES AND THE UNIVERSE EVOLVED. DEUCE REPRESENTS THE FIRST CALIBRATION OF STELLAR IONIZING FLUX MODELS IN THE 700-900A REGIME AND WILL ULTIMATELY HELP TO SHED LIGHT ON THE VIABILITY OF B STARS AS MAJOR CONTRIBUTORS TO REIONIZATION BETTERING OUR UNDERSTANDING OF THIS CRITICAL PERIOD IN THE UNIVERSE'S EVOLUTION