They are responsible for traveling with their cabin group or field study group, for keeping them together and safe, and for helping them to have a successful experience.
Invite them to help you on field study. They can monitor/supervise groups, help with activities, carry equipment, take students to the restroom, and help students who are having trouble. They can sit one on one with students who need a break.
They are willing to work with and for you, but they need to be asked respectfully to do so. They don‟t know what to do unless you ask them.