IIRC, this'd be from either 0.7 or 0.75, where the original training map (made by Bubba?) had every possible vehicle/kit ingame imaginable.
The plane/helicopter you see is the V22-Osprey, which I've only ever seen in that training map (on kashan training v .7/.75) unless it was in earlier builds.
The Osprey doesn't kill them because of the assigned materials on the insides, and more importantly, because it's actually hovering as opposed to moving at all.
Hope that answers everything, personally I prefered the training mode of 0.75 myself as well, for that exact reason
