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The purpose of this study was to assess the validity of the 1-mile walk (Rockport Walk Test) as a predictor of VO2max and determine whether the 1-mile walk is a reliable alternative to the 1.5-mile run in moderately fit to highly fit U.S. Air Force males. Twenty-four (33.0 ± 1.5 years) males completed a maximal treadmill VO2max (50.3 ± 1.4 mL/kg/min), 1-mile walk, and 1.5-mile run. For the 1-mile walk, there were no significant differences between measured and predicted VO2max (p = 0.177, r= 0.817). There were no significant differences (p = 0.573) between points scored in the Air Force Fitness Test liar the 1-mile walk and 1.5-mile run tests. In conclusion, the 1-mile walk test is a valid predictor of VO2max and can be used as an alternative fitness test to the 1.5-mile run in assessing cardiovascular fitness in Air Force males. [ABSTRACT FROM AUTHOR]