1-13. The primary role of external military forces during stabilization efforts may be to build host-nation military force capability and capacity. Additionally, military forces may be asked to support the comprehensive efforts of interagency and intergovernmental entities, which are in place to develop host-nation capacity to execute critical government functions. Unified action is an indispensable feature of building host-nation capacity. In stability operations, unified action to enhance the ability of the host nation for security, governance, economic development, essential services, rule of law, and other critical government functions exemplifies building host-nation capacity. (See JP 3-07 and JP 3-20 for additional information on building host-nation capacity).