1) Type of Military operation 
Police action in military/security studies and international relations is a euphemism for a military action undertaken without a formal declaration of war. Since World War II, formal declarations of war have been rare especially actions conducted by developed nations in connection with the Cold War. Rather, nations involved in military conflict (e...
[n] - a local military action without declaration of war
noun a local military action without declaration of war; against violators of international peace and order