Abstract: This study investigated the contributions of Rwanda Defense Forces (RDF) of socio-economic activities and community welfare of citizens of Rwanda the case study of Gasabo district. The study applied both qualitative and quantitative methods of data collection and analysis using questionnaires and interviews. Data was collected from a total of 379 general RDF field officers and 384 community members using survey questionnaires and 5 high rank RDF officers using interview guide. The study findings revealed that the significant socio-economic activities conducted by RDF include; construction of classrooms (mean=2.5736), construction/rehabilitation of houses for vulnerable people (mean= 2.6138), houses constructed for genocide survivors (mean=2.6882), distribution of electricity (mean=2.6260), agricultural and environmental protection (mean=2.6756) and construction of Health, milk and potato collection centres (mean=2.7202).