As part of the Skills Selection and Sustainment (S3) program, this research evaluated the potential effectiveness of spatial, psychomotor, and leadership scales as additional selection criteria for the Excellence in Armor (EIA) program. The S3 predictor tests were administered to 1,642 One Station Unit Training (OSUT) soldiers at the Fort Knox reception station. In addition, 479 19K (M1 tank crewmen) OSUT soldiers were given an engagement tank gunnery test on the high-fidelity Institutional Conduct of Fire Trainer (I-COFT). The I-COFT test included offensive and defensive engagements fired in normal and degraded operational modes. The primary analysis evaluated I-COFT speed and accuracy as a function of S3 spatial/psychomotor scores. The S3 spatial/psychomotor tests were a strong predictor of simulated tank gunnery performance, yielding a correlation of .54 with I-COFT speed/accuracy. The 2-1/2-month interval between the predictor and criterion tests suggests that the relationship should remain stable over time, and the relationship shrank only slightly when the EIA soldiers were given additional training. The results indicate that including the S3 tests in the EIA selection process would result in EIA graduates with stronger gunnery skills. Keywords: Personnel selection, Gunnery prediction, Unit conduct of fire trainer, Performance(human). (sdw).