Head to the Bwala ya Masa village. Remember that during this entire mission you are not allowed to kill anyone although you may still neutralize them. If you have to use the sleep ammunition or face the teenage warriors in melee combat. If you prefer the close range fighting try to focus on series of punches and on throwing them around since you are not able to catch them the same way you can catch the adults.
Your goal, White Mamba himself, is on the ship wreck in the west part of the village. The best path there leads from the south (you have to walk around the village from the east first) still you need to keep crouching or crawling, most preferably while staying close to the water. If you have taken D-Dog with you use him to mark and avoid other warriors.