Participants in a course with CSF can apply for a B-1 Business Visitor Visa.
For more information, consult
https://travel.state.gov/content/travel/en/us-visas.html
What is business related (B-1) visitor visa travel?
Generally, the travel appropriate for a business (B-1) visitor visa includes travel these examples of travel to:
* Consult with business associates;
* Attend a scientific, educational, professional or business convention, or a conference on specific dates;
* Settle an estate;
* Negotiate a contract;
* Participate in short-term training.
To learn more about allowable travel using a B-1 visa, review the information on the above site. Select visitor visa to learn more about the application requirements. This is not an all-inclusive list of allowable business related B-1 visitor visa activities. Select visitor visa to learn more about the application requirements. If a visa applicant has specific questions about qualifications for a visa, contact the U.S. Embassy or Consulate where you will apply for the visa.