A South Sudan army soldier, with a national flag wrapped around his head, holds his weapon in Bor
A South Sudan army soldier, with a national flag wrapped around his head, holds his weapon in Bor, 180 km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY)
An aerial view shows temporary settlements set up along the banks of river Nile by people displaced by fighting between the government army and rebels in Bor
An aerial view shows temporary settlements set up along the banks of river Nile by people displaced by fighting between the government army and rebels in Bor, 180 km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY)
A man rides on a donkey past South Sudan army soldiers in Bor
A man rides on a donkey past South Sudan army soldiers in Bor, 180 km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST ANIMALS MILITARY)
South Sudan army soldiers hold their weapons as they ride on a truck in Bor
South Sudan army soldiers hold their weapons as they ride on a truck in Bor, 180 km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY)
South Sudan army soldiers are pictured in Bor
South Sudan army soldiers are pictured in Bor, 180 km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY)
South Sudan army soldiers hold their weapons as they ride on a truck in Bor
South Sudan army soldiers hold their weapons as they ride on a truck in Bor, 180 km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)
South Sudan army soldiers walk to board a military helicopter at Juba international airport
South Sudan army soldiers walk to board a military helicopter at Juba international airport, before heading to Bor, 180km (108 miles) northwest from the capital December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY)
South Sudan army soldiers pose for a photo while celebrating their victory in Bor
South Sudan army soldiers pose for a photo while celebrating their victory in Bor, 180 km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY)
A South Sudan army soldier holds a cigarette and his weapon in Bor
A South Sudan army soldier holds a cigarette and his weapon in Bor, 180km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)
South Sudan army soldiers hold their weapons as they celebrate in Bor
South Sudan army soldiers hold their weapons as they celebrate in Bor, 180km (108 miles) northwest from capital Juba December 25, 2013. South Sudanese troops have retaken the flashpoint town of Bor in Jonglei state, a week after the town fell to rebels loyal to rebel leader Riek Machar. REUTERS/James Akena (SOUTH SUDAN - Tags: POLITICS CIVIL UNREST MILITARY)