Having an objective to protect an APC or a tank (can be AI-drived) through a city and have it follow the team (always stay behind the last team member or something so it doesn't run forward and get destroyed) could be interesting. Would require adding AT stuff like the AP/AT m203 40mm round (50mm steel penetration), RPG, LAW, AT4 and/or something else. As much as people say it's not good to have them because they'll be used against people, I think it wouldn't be like it, because AT weapons don't have a good kill radius, nor pay off to carry for killing people. The only use I know of for RPG/LAW for killing people is shooting it at the edge of a window or a rock to make the fragments hit the guy hiding behind it.
Also if it's a tank instead of an APC it would require more strategy to destroy, as man-portable AT weapons are usuall uncapable of penetrating a tank's front armor, so will require flanking or accurate shooting between the hull and the turret.