This thesis is an analysis of the construction of the the official Brazilian Army identity. Extensive and unprecedented survey conducted with over six hundred trained career officers at the Military Academy of Agulhas Negras (AMAN) clarifies the current profile of the identity of army officers focusing on variations driven by postmodernity. The question that guides all the work is: with the arrival of these social transformations from the 1970s, has the identity of the Brazilian Army changed? First there is an exhibition about the theoretical concept of identity with approaches from sociology and psychology, and philosophy texts, in which parallels are drawn between identity and character, identity and recognition, identity and difference, besides the approaches of professional identity, values and institutionalization and labor organizations. The identities in modernity and post-modernity are described from a sociological view addressing the differences imposed on individuals and institutions in personal and professional relationships, characterizing the necessary flexibility of identities, including the military life. Beyond that, visions of acclaimed authors about the identity of the man and the Brazilian military, highlighting the values worshiped based on biographies of patrons Army. Concluding the analysis by statistical quantitative and qualitative, all the theorizing is confronted with the data obtained in the survey conducted with career officers for obtaining the profile of the identity of army officers focusing on variations driven by postmodernity.