Cadet Leader
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Cadet Leader is a rank held by senior cadets in the St. John Ambulance Brigade.
Cadets holding this rank are normally between their 15th and 18th birthdays. They rank above Cadet NCOs but are subordinate to Adult Members and Officers.
The badge of rank for Cadet Leader varies from nation to nation, but in most countries (including the UK and Singapore) it is two horizontal white stripes with a white wavy band in between, worn on both shoulder straps. image will follow
Source: St John Ambulance Brigade Regulations (Overseas Edition)