and radial velocities obtained by the SSPP for stars with a reasonable likelihood of membership in previously studied Galactic globular and open clusters are sufficiently accurate to justify the use of the present SSPP parameters for carrying out detailed studies of the halo and thick-disk populations of the Milky Way. In deriving the overall iron abundance for each cluster, we assume it comprises a chemically homogenous population. In §2, the photometric and spectroscopic data obtained for M 13, M 15, M 2, NGC 2402, and M 67 are described. Section 3 presents the methods used to separate likely cluster members from field stars in the directions toward these clusters. Best estimates of the overall \[Fe/H\] and radial velocity of each cluster are derived in §4. In §5 we compare the SSPP determinations of $T_{\rm eff}$ and log $g$ for selected member stars in each cluster with their expected positions on color-magnitude diagrams. A summary and brief conclusions are provided in §6.

Photometric and Spectroscopic Data
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Galactic globular and open clusters are nearly ideal testbeds for validation of the stellar atmospheric parameters estimated by the SSPP. In most clusters, it is expected that their member stars were born simultaneously out 