This research explored possible between-assessor differences in the validity of assessment center ratings Thirteen Army recruiters were trained as assessors, they then evaluated 450 soldiers on four different assessment exercises These soldiers subsequently entered the Army's recruiter school, where training performance scores were gathered. A unit-weighted composite of the assessment ratings correlated .32 with overall training performance. Regarding differences between assessors in assessment validities, a nonparametnc randomization test revealed that these differences were at a level not greater than chance However, there were significant differences between assessors in mean assessment ratings Possible reasons for the validity finding are that the randomization test lacks statistical power to detect actual differences in this setting, that assessor training smoothes out differences in abilities related to accurate assessment, and/or that assessment exercises uniformly provide all assessors with good (and equal) opportunity to view behavior relevant to criterion performance. Additional research possibilities in this area are discussed m light of results obtained here and methodological issues raised in the article.