LVT, LVT(A), AMTRAC, and Alligator

[zenrat]

A selection of LVTs on this pic from the Wikipedia Sands of Iwo Jima page.

[Weaver]

That's interesting: I didn't know that those four rectangular shapes on the back of the rear-engined versions were pipes that stood up (see the LVT(A)-4 in the foreground). I thought they were just mushroom-style vent-covers. 

[jcf]

Cheers Jon.
Just to be clear, the 40mm guns were mounted on a pedestal in an open-topped LVT-4, not on a roof:

Yes Harold, I know, that's why I said closest to. 

Yes Jon, I know you know, but I was making it clear for other people who may only have seen the side profile you posted... 

[Old Wombat]

That's interesting: I didn't know that those four rectangular shapes on the back of the rear-engined versions were pipes that stood up (see the LVT(A)-4 in the foreground). I thought they were just mushroom-style vent-covers. 

I think you'll find they are vent covers, mate, but that the (rear) engine hatch, to which they're attached, has been opened.