As an air engineering technician in the royal navy I heard that you serve with the royal marines. Would this involve doing any marine training?

Royal Navy Air Engineering technicians (AETs) serve both at sea and when aircraft are ashore supporting land troops.

An AET does have the opportunity to work with the Commando Helicopter Force which as the name suggests will work with Royal Marines both at sea and ashore.

There is an opportunity for some (not all) to volunteer for Royal Marine training but I stress this is voluntary and by selection.