Update on that Chadian soldier, it would turn out that he is part of the FAS (Forces Armées et de Sécurité) Commandos. These guys are a Chadian Special Forces group, well trained and well armed for desert warfare, that soldier's AK configuration is actually standard issue for members of his group.
Here's proof:
These guys are highly renown, one story that pops up a lot is how their group infiltrated a column of Gaddafi's soldiers in the midst of a sandstorm and practically destroyed the entire unit.
On more tragic news however, Chris Kyle, the most deadliest sniper in US Military to date(recorded with over 160 confirmed kills) was killed at a gun range in Texas along with another man, Chad Littlefield. The man was famous for his writing the book "American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History" and even help started a non-profit group to assist with war veterans; FITCO Cares.
According to the group's director, Tavis Cox, Kyle and Littlefield had taken a man suffering from PTSD to a range to help him out but in turn were killed by his hand. The man was Eddie Ray Routh who was a corporal with the US Marines, deployed in Iraq in 2007 and was currently listed as a reserve.
Chris Kyle survived being shot twice during his tours of duty, he survived a number of IED explosions and he survived an $80,000 bounty on his head, but he was killed in his home state by a fellow veteran. It's really a tragedy.