"The sacrifices are great. It is very hard to be separated from the family for such a long time," Brigadier General Okonkwo says.

"As a commander, it has been a challenge to lead a force with so many different contingents. The troops come from different backgrounds. Some do not speak English.

"You have to be very patient and make an effort to understand each contingent.

"But it has been extremely instructive for me."