This movie was about convicts then became soldiers.. hated each other different gangs etc... went to war.. somewhere in korea or japan.. or vietnam.. I don't know.
Well anyway, one of the turning points of the movie was when one of the actors was captured by the enemy and got a bag put over his head with a poisonous snake... he ended up eating the snake and sayins "whats for desert"
Can anyone help??

"The Dirty Dozen ". Maybe?

Soldier Boyz