The landscape of warfare is constantly evolving, demanding innovative approaches to maintain a technological edge. Integrating Commercial Off-The-Shelf (COTS) technologies offers a promising avenue for militaries to enhance capabilities while optimizing resources. Although this integration offers opportunities, there is no standardised approach available to militaries to ensure successful integration. This paper explores Capability Engineering (CE) as an approach suitable to successfully integrate COTS technologies in military operations. The paper explores literature for CE and related applications, including the literature related to the integration of COTS in military systems. The paper then presents the rationale for CE framework for the implementation of COTS integration in military capabilities. The contribution of this research is the proposal of the Capability Engineering (CE) framework for integrating COTS products at various levels of Military Capabilities (MC). The paper also presents some examples of COTS products integration in military capabilities.