COSMOS employs 24 undergraduate students as Residential Assistants (RAs) who live in the dorms with the students. The primary responsibilities of the RAs are to enforce the program rules, organize extra-curricular activities, and accompany students to class and on field trips. Two RAs are assigned to each cluster and remain with the group of students throughout the four weeks. The RA staff is supervised by two Senior Resident Assistants (SRAs) and a Resident Dean. SRAs are typically undergraduate students who have served as a COSMOS RA during a previous program.