This work aims mainly to classify the speech act of order performed by soldiers in the Brazilian Army taking into account interactional and cultural aspects underlying this type of utterance, in order to promote the viability of a more effective Portuguese language teaching method for foreign soldiers. Thus, the theoretical foundation of this paper is based on an interdisciplinary approach that emphasizes the interface between intercultural and interactional aspects from a pragmatic perspective. This study consists of a qualitative research that uses direct ethnographic microanalysis to examine the speech act of order in the military environment recorded in four situations of case study in which volunteers participate in interactions where the speech act is present. Therefore, in such circumstances, contextual variables such as power distance, social distance and urgency to carry out orders are considered according to what is proposed by Brown and Levinson (1987) and Hofstede (2010). The results point to the use of strategies of politeness to minimize the act of threat when an order is given, and they indicate that there is always at least one of the following interactional variables: short hierarchical distance, close social proximity and non-urgency of order. In this manner, Portuguese teachers are have resources and theoretical foundation to convey to their students both idioms and cultural idiosyncrasies of the language they are teaching, and improve students language skills.