The current study sought to identify groups of navigation students and master mariners (captains) characterized by different constellations of the Big Five personality traits and aggression levels. We hypothesized that master mariners would exhibit the resilient personality type and that navigation students would additionally exhibit personality types other than the resilient (e.g., over- or undercontrolled). A sample of 108 navigation students (men, in their second or third year of naval school, all active athletes) and 76 master mariners took part in the study and completed the Polish version of the NEO Five-Factor Inventory (Costa & McCrae, 1992; Zawadzki et al., 1998) and the Aggression Questionnaire (Buss & Perry, 1992; Tucholska, 1998). The hypothesis about the resilient personality type among master mariners was confirmed. The second hypothesis about personality types other than the resilient among navigation students was also confirmed: 33% of the students exhibited the overcontrolling personality type. The article also highlights the need to include psychological assessment in naval school enrolment procedures.