In what type of situations should the firefighting acronym LUNAR be used?

The acronym LUNAR was adapted as a way to remember what critical pieces of information should be transmitted in a situation where a firefighter is trapped. The reporting individual will give his Location (third floor near the north stairwell), his Unit (engine 46), his Name (firefighter Maxwell and firefighter Weston), his Assignment (searching for victims), and his Needs or the resources he is requesting (two air bottles and a pry bar to extricate a firefighter who has been trapped in a floor).