Soldiers of the Chadian army guard on January 21, 2015, at the border between Nigeria and Cameroon, some 40 km from Maltam, as part of a military contingent against the armed Islamist group Boko Haram. Chad, seen as having the most capable military in the region, sent on January 17-18, 2015 a convoy of troops and 400 military vehicles into neighbouring Cameroon to battle Boko Haram. AFP PHOTO / ALI KAYA (Photo credit should read ALI KAYA/AFP/Getty Images)
