Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: The Independence, commissioned in 1959, is the US Navy's oldest active ship. It served in the 1962 Cuban missile crisis, the liberation of Grenada in 1983, the Gulf War in 1990 and last year's tensions between Taiwan and China.

liberation