Which government has the right to maintain a army or navy?

The right to maintain an army or navy typically resides with sovereign states or national governments. These governments possess the authority to establish and fund military forces for national defense, law enforcement, and other security purposes. In federal systems, both national and state governments may have military capabilities, but the central government usually has primary control over armed forces. Additionally, international treaties and agreements can influence the extent and nature of military forces that countries can maintain.