ROME ? The Army is envisioning a chain of regional drone training centers in Africa focused on using the collective expertise of participating countries to usher in a new era of tackling the continent?s thorniest security issues, the service?s highest-ranking officer in Europe and Africa said this week. That effort will kick off next month in Morocco during the military exercise African Lion, Gen. Christopher Donahue said Monday. The annual exercise will take place in April and May across Morocco, Tunisia, Senegal and Ghana and include more than 10,000 participants from 20 nations, according to U.S. Africa Command. It also will include a small drone training module for 16 participants,...