You can find more details about the program on the ERS website. Here are the qualifications they list for applicants:
- Applicants must be currently enrolled in an accredited college or university.
- Applicants must be planning to continue their education in the fall semester.
- Because an internship is an "excepted service appointment," candidates must be a citizen of the United States or meet the criteria in the current appropriations law. For information see: http://www.usajobs.gov/ResourceCenter/Index//Interactive/NonCitizensEmployment#icc