<human>:  Why did the British Home Guard have a spitfire?
<bot>: The Spitfire was a British fighter plane that was used in World War II. The Home Guard was a volunteer military force that was formed in 1940 to protect the UK from invasion by Nazi Germany. The Home Guard was made up of ordinary citizens who were trained to fight in case of invasion. The Home Guard had a number of different roles, including guarding key points, providing medical care, and fighting in the event of an invasion.