Diesel 4-Door Wrangler?

While out running errands I happened to spot a Rescue Green 4 door Wrangler in a parking lot and asked Melissa if she minded the color. I insisted we drive up close to see it and when we pulled up next to it I noticed that this was a diesel mule vehicle for testing. I snapped some pics with my cameraphone:

The badging also said it was a Sahara model. Today I compared the Sahara to this vehicle and one detail that stood out was the rear bumper lights in the test vehicle.