Cohesion, team trust, stress, perceived Self and collective efficacy are considered to be significant factors of military teams performance efficacy. Still it is not clear, what the interaction between these factors are and in what way they predict performance efficacy. For the purpose of the study three questionnaires were developed: Perceived Military Stress, Perceived Military Self–efficacy and Perceived Military Collective Efficacy questionnaires, two scales of other authors were adapted to Lithuanian military population. 160 soldiers of Lithuanian professional military, belonging to 28 military teams (sections) took part in the research. It was estimated that cohesion, team trust, perceived Self and Collective efficacy are related to performance efficacy. Path model proves, that perceived collective efficacy is the most important variable predicting military team’s performance efficacy and stress. Team’s performance efficacy can also be predicted by cohesion, team trust and perceived Self - efficacy, but these factors predict performance efficacy not directly, but through perceived collective efficacy. Besides, higher levels of perceived Self and collective efficacy characterize person with international operation experience. Privates tend to experience higher levels of stress and to trust their teams less to compare to junior privates. Commanders of the section and their subjects evaluate their teams similar