This policy brief proposes an innovative model of citizen security for the Santa Cruz neighborhood in Rio de Janeiro, grounded in the human security paradigm and integrated territorial development. It argues that urban violence in the region is a structural phenomenon, fueled by historical inequalities, racial and territorial exclusion, and the fragility of state presence. In contrast to purely coercive approaches, the document advocates for the articulation of social, economic, and cultural policies as an effective prevention strategy. Based on local diagnostics and national experiences that integrate defense actions with social development - such as the Ágata Operations in border regions and logistical support for community infrastructure programs - the brief recommends the implementation of the Santa Cruz Cidadã Project: a pilot initiative that mobilizes the infrastructure and logistical capacity of the Brazilian Armed Forces - especially the 1st Combat Engineering Battalion - in partnership with the municipal government and UN-Habitat. The project is structured around five axes: opportunities and sustainable tourism; education and technology; culture and sports; engagement and citizen security; and sustainability and monitoring. Its alignment with the Sustainable Development Goals (SDGs 8, 11 and 16) reinforces its potential as a replicable public policy, capable of converting vulnerability into opportunity and building security through human development and trust between the State and society.