This is the what you call a Boodle Fight. It is a military style of eating where long tables are prepared and food are on top of the banana leaves. Viands and rice ready to eat using your bare hands, jugs of water are prepared on the side to wash hands before the "eating combat". With the signal to start the boodle fight, everyone aims for his/her position.

It is done to promote unity and camaraderie among the military and a sense of trust with their colleagues. After all, you eat with bare hands in a mountain load of food – which is I might need to add, arranged in such a way that it resembles the type of food you give to your pets.