If I write a ticket to an officer on another agency, and a mutual aid agreement causes us to work together in a major event, would I rather he or she get my back, or be thinking about that ticket I wrote them a few weeks ago?

FORBES: Q: What are some cultural faux pas in police departments?

The number of officers needed is more than the PSNI can provide so more than 3, 000 officers will be from other police forces in Britain, brought in under what is called an agreement for mutual aid.

BBC: Northern Ireland

IR--An alliance is a formal treaty or agreement between states, commonly for the purpose of mutual aid in the event of war against a common enemy.

ECONOMIST: No to NATO expansion