American Embassy Branch Office in Douala Cameroon

Visa types granted by the United States of America are;

United States of America Emergency Visa (on Holidays/Weekends)
United States of America Visa for Diplomatic/official/ Laissez-Passers Passport Holder
United States of America Visa for individuals working in designated US Agencies or technology areas
United States of America Tourist Visa
United States of America Business Visa
United States of America Employment Visa
United States of America Transit Visa
United States of America Medical Visa
United States of America Student Visa (Study/Research/Internship)
United States of America Entry Visa
United States of America Conference Visa
United States of America Mountaineering Visa
United States of America Missionary Visa
United States of America Journalist Visa(Journalist/Documentary filming)
United States of America Film Visa: Visa for shooting Feature Films

Here are some ESTA articles that might help you.

American Embassy Branch Office in Douala