Deviant behaviors among military personnel are being considered. Healthy servicemen and servicemen with various forms of deviant behaviors (addictive, suicidal, and antisocial) were examined using clinical psychopathological, experimental psychological, psychophysiological, and neuropsychological methods. The survey results by various methods were analyzed statistically, and their significance in diagnosing the propensity for deviant behaviors of servicemen is studied. The isolated use of individual methods does not increase the efficiency of the diagnostic process. Moreover, the combined use of neuropsychological (affective priming and Wisconsin card sorting test) and psychophysiological (oculography) methods with a high level of reliability makes it possible to differentiate healthy military personnel from military personnel prone to deviant behaviors. The most informative psychophysiological signs when performing neuropsychological techniques were the frequency and duration of blinking and duration of gaze fixations. An algorithm for diagnosing deviant behaviors of military personnel has been developed based on the analysis of neuropsychological and psychophysiological indicators using an ethological approach (oculography and pupillometry).