My money is on Artillery; I thought your photo looked more like red over blue. I have a unit marking on the end of the bench which went into the back of a 3/4 ton line truck. The unit was RCHA here in Shilo.
By the way, if anyone wants the bench, it's theirs for $5. Pickup only. I know where one of the lockers is located that goes on top of the bench, along with most of the other doo-dahs to make your common M37 into something rare (and even consume more fuel it that is possible).