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We present initial results from the Dark Energy Spectroscopic Instrument(DESI) Complete Calibration of the Color-Redshift Relation (DC3R2) secondarytarget survey. Our analysis uses 230k galaxies that overlap with KiDS-VIKING$ugriZYJHK_s$ photometry to calibrate the color-redshift relation and to informphotometric redshift (photo-z) inference methods of future weak lensingsurveys. Together with Emission Line Galaxies (ELGs), Luminous Red Galaxies(LRGs), and the Bright Galaxy Survey (BGS) that provide samples ofcomplementary color, the DC3R2 targets help DESI to span 56% of the color spacevisible to Euclid and LSST with high confidence spectroscopic redshifts. Theeffects of spectroscopic completeness and quality are explored, as well assystematic uncertainties introduced with the use of common Self Organizing Mapstrained on different photometry than the analysis sample. We further examinethe dependence of redshift on magnitude at fixed color, important for the useof bright galaxy spectra to calibrate redshifts in a fainter photometric galaxysample. We find that noise in the KiDS-VIKING photometry introduces a dominant,apparent magnitude dependence of redshift at fixed color, which indicates aneed for carefully chosen deep drilling fields, and survey simulation to modelthis effect for future weak lensing surveys.

DESI Complete Calibration of the Color-Redshift Relation (DC3R2): Results from early DESI data