Howdy from down south.........
Normally the Chevy tail lights and brake lights are red as are the turn signals. They are the double element bulb. The brake lights and flashers (and turn signals) share the same element and the tail lights are the other element.
In order to have orange flashing lights the back-up lights were, I'm guessing, rewired to operate as flashing indicators and orange bulbs installed. I've seen this on other convoy and critical response vehicles were they wanted emergency flashers and brake lights to operate independently. Airport based vehicles are sometimes wired this way as well.
Nice van BTW. It looks to be low mileage.
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"A ship is safe in harbor, but that's not what ships are built for."