150420-N-EC444-147 DAKAR, Senegal Hospital Corpsman 1st Class Richard Spells, from Battle Creek, Mich., center, and Hospital Corpsman 2nd Class Tracie Cline, from La Crosse, Wis., left, demonstrate medical techniques in support of Exercise Saharan Express 2015, April 20. Saharan Express is a U.S. Africa Command-sponsored multinational maritime exercise designed to increase maritime safety and security of the west coast of Africa.