Link to thread.
The way it works is this: There is no need to actually have The United Nations Wonder. Instead, you must build the UN Mission, of which you can only have one, where your Palace is. When you build it, are able to produce the units below. Every vehicle has a special role, and some can carry UN Peacekeepers. The UN Diplomat acts as a mini-Great Spy, giving you a small amount of EP when used. Since they can only defend, they are cheap units, and should be used to augment your offensive forces--cover up resources or act as roadblocks. You must, however, declare war to have those effects. But you can pre-position your UN Forces since you can enter any civ's lands.
UN Fighting Vehicle
UN Mobility Vehicle
UN Transport Airplane
UN Transport Helicopter
GarretSidzaka for the UN Peacekeeper skin
Snafusmith for the UN Peacekeeper gun prop, Humvee model
asiaoasioasio for the Stryker AFC model
Nautil for the Mil MI 26 model
[BTS] UN Forces ModComp 2016-10-05
[BTS] UN Forces ModComp