Gunny needs your help again in Gray Zone Warfare with the Last Farewell mission. As you might expect, this mission involves placing another tracker on a key location, and this time you have to track down another missing body, which is never a good thing.
Last Farewell/Abandoned Mission | GUIDE | Gray Zone Warfare | Mithras
As you might expect, you only have a little information to go on when trying to find this body for Gunny. You can read up on the details before you set out on this Gray Zone Warfare mission, and it should give you a good idea of where to start looking.
You'll need to narrow down the location using certain clues from the mission and study the map to figure out how to complete Last Farewell.
To find the body in Last Farewell, navigate to the gas station in town and take the road out of town until you reach a farm. You probably discovered this gas station from one of the first missions you played or when searching for the Little Bird Down location.