Normal troopers in Rancor are just ARF troopers both in lore and on the server just look at their Rancor Trooper job it's always been an ARF. They are asking for normal regiment jobs like everyone else just their design would fall in line with Rancor's lore. Similar to how everyone in 21st wears Galactic Marine armor. It's just their quirky design.
Also they are 18 jobs and are asking for 2 more meaning they will be at the limit not exceeding it as the suggestion states.