The article presents the issues covered by the subject of psychology in the training program for cadets of the Military University of Technology in Warsaw, in particular the issues of prejudice, discrimination and assertiveness. A modern soldier performs tasks in a multicultural environment. The military is no longer a gender-homogeneous group. In this context, the issue of eliminating prejudices and discrimination becomes particularly important. Assertiveness competences enable better interpersonal communication and prevent conflicts in social relations. Higher education of the military should take these threads into account, as is done today.