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We identify 34 highly-probable detached, red giant eclipsing binary pairsamong 315 candidates in Devor's catalog of $\sim$10,000 OGLE-II eclipsingbinaries. We estimate that there should be at least 200 such systems inOGLE-III. We show that spectroscopic measurements of the metallicities andradial-velocity-derived masses of these systems would independently constrainboth the age-metallicity and helium-metallicity relations of the GalacticBulge, potentially breaking the age-helium degeneracy that currently limits ourability to characterize the Bulge stellar population. Mass and metallicitymeasurements alone would be sufficient to immediately validate or falsifyrecent claims about the age and helium abundance of the Bulge. A spectroscopicsurvey of these systems would constrain models of Milky Way assembly, as wellas provide significant auxiliary science on research questions such as massloss on the red giant branch. We discuss the theoretical uncertainties instellar evolution models that would need to be accounted for to maximize thescientific yield.

Detached Red Giant Eclipsing Binary Twins: Rosetta Stones to the Galactic Bulge