World Surveillance Group Inc (fka WSGI)

[Baghdad Bob]

I assume it is done with gas transfer or servos and lines

Bladders, 4 or 8 alined front to back on quadrants and possibly @ 45 deg position. Think of double skin pinched to form pockets.

Increase/decrease pressure in opposite sides causes turn.

Now I'm not going to swear to this, but that's what I remember.