This contract has us taking on the fort at Chinchorro. Now if you have already taken over the fort previously, a restricted area will appear inside the fort’s walls. If you have not yet taken over the fort, now is about as good a time as any to do so. Check out the fortress section for a guide to taking the fort down!
Once you arrive, the target will be hiding somewhere in the green zone. Enter the area and use Eagle Vision to identify him. For me, he was patrolling behind the cage in the grass covered courtyard on the south side of the fort at the second level. Once he has been identified, assassinate him to fulfil the requirements for the contract.