It’s a new generation.
Consider a well put together a video that highlights the positive aspects of cadets - flying, shooting, first aid, sports, plus the fact that it looks good on Cvs -most students look forward to putting something on their CVs apart from GCSEs and A-levels. Make it amusing and fascinating.
Moreover, don’t make it repetitive or too long. A trailer of 1-2 minutes should be enough, especially to captivate a younger audience.