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BTW, what was the crane originally designed to move?
The crane was origanally designed to lift out entire racks of ammo from the FAASV. The original idea was that the ammo racks would be loaded on the ground or a flat rack from a PLS and they would simply lift the empty rack out of the FAASV and replace it with a full one, simmilar to changing a magazine in a weapon. As you see below, the ammo (projectile) racks are in the front portion of the FAASV.
The roof opens above them for loading and unloading. This system is not actually used in the field. It is easier to load individual rounds, that way you can custom tailor the load of rounds you carry by type.
In the picture below of the latest version, the M992A2, the stacker too is removed, these were ineffective and took up room too.
There you have it.