Both, Cadets and Adult Volunteers, are eligible to apply for a Service Medal.
The Army Cadet Service Medal (ACSM):
Service qualification for cadets, is after four continuous calendar years of service with an Army Cadet Corps.
Adult Volunteer Service Medal (AVSM):
Service qualification for adults, is five continuous calendar years. A member must have successfully completed a minimum five (5) continuous years of meritorious service with the Army Cadet Program as a volunteer working at a local support committee, and have been a registered member of the ACLC.