"The P.E.T.N. source has been located and TF Mako is sent to Sarajevo to look up a few old friends who may be of help."
— Missions Menu Description
Old Friends is the eleventh campaign mission for Medal of Honor: Warfighter. Working from Hassan's Information, TF Mako pins the sales of PETN to a Gunrunner whom Dusty has history with from the War In Bosnia. TF Mako link up with TF Atlas GROM Operators whom Voodoo has a history with. They then chase the gunrunner through ruins of Sarajevo and fight many mercenaries he hired. After disabling his getaway vehicle. The gunrunner is captured and pushed to devel information as to where the missing PETN is being shipped.
For some reason, Sarajevo is still in a significant state of destruction and disrepair, despite the fact that by 2003 there were almost no ruins left in the city and bullet holes became rare, and Warfighter takes place around 2007.
Out of the broken arcade machines that can be found in the old stadium, some of them is called Allied Assault, a reference to Medal of Honor: Allied Assault.
The bridge featured at the start of the mission is actually not a part of Sarajevo, but rather the key landmark of the city of Mostar, located over 100 km away from Sarajevo.
In the game guide, Stump was supposed to be wielding a DD MK18 but was changed in final game.
In one of the trailers for the game, Bosic was subdued by Voodoo and Greko was killed by getting run over with a car.
The level says that it's set in Sarajevo, when in actual fact the level is set in the Bosnian town of Mostar.