I've not seen it for quite a while, but it's possible that they used visually modded non-Hinds (like they did with Red Dawn). The reality is that personnel carrying aircraft/helos are made to be as small as possible (lower weight and harder to hit), and even moreso when they combine the role of gunship with troop carrier. And it's not just theirs. Trust me, it's hazardous simply to be tall and board an Osprey or Chinook without a helmet.
I am working on them every possible chance I get