It may also refer to interaction, communication, or a meeting between such persons. The verb liaise is derived from the term liaison and often implies to function as a liaison by coordinating, aiding, and communicating. To be able to liaise well with others means to be able to communicate effectively with them. In military terms, a liaison officer is responsible for establishing good relations with local inhabitants and maintaining lines of communication with higher headquarters. In peacekeeping operations, national authorities generally appoint a chief of mission who is responsible for maintaining effective contact between their country's forces and those of other countries. In an organization, a liaison officer would be designated to act as a go-between for groups of people with different needs or questions. For example, in a large corporation, a corporate communications department might be charged with mediating problems between employees and management. Or, in a hospital, a patient advocate could help mediate differences between patients and staff members. Liaison officers are also used by certain organizations to describe someone who interacts with the public as part of their job. For example, in a police force, a police liaison officer would be responsible for keeping the police station up to date with community issues and complaints, while also helping to resolve conflicts that may arise between the police and citizens.