[ChalkLine]

Use in combat in the Twilight 2000 setting

You'll note that I have not referred to this vehicle as either a Light Tank or a Reconnaissance Vehicle. This is although it has often been used in these roles where it predictably performed extremely badly it was not envisioned for these roles when it was designed. The USSR experimented with it for these and rather unscrupulously marketed it as them but it's not either. In fact what its actual role is for is quite different.
Let me explain. The PT-76 gets a bad rap in T2K and Cold War gaming because it's huge, thin-skinned, under-powered and has a very bad turret/crewing design choice. The usual assumption is that the soviet union screwed up with it but kept it on because the chassis was useful.

What it's actual role is for is extremely narrow. It's a boat that can climb over sandbars and provide fire support to troops assaulting rivers and beaches, places where the soviets took extreme casualties in The Great Patriotic War. When you examine the following aspects it starts to make sense;

- Actual zero gun depression.
- Very large hull but a tiny turret.
- A gun with a medium calibre but ammunition the soviet union had already discontinued using.
- Very thin armour, so thin it can only stop rifle ammunition and shell fragments.
- All systems placed below the turret ring.
- Limited vision blocks. Less rather than more than their MBTs, an odd choice for a scout vehicle.
- Very large, strange, two man hatch with a superimposed commander's hatch.

Looking at these things you start to see why the soviets made their trade-offs in design.
The gun has -0º depression because it's meant to shoot from the water level upwards. [Edit: The hull was modified in 1957 to allow the gun to get a -4º gun depression. I suspect that the buyers were unimpressed] The D-56T tank gun (it's actually a unique gun, not a conversion as some sources say) uses a comparatively large calibre round because they contain more HE filler. If it was to use a 'tankerised' S-60 57mm autocannon it couldn't store the amount of ammo it would need to put down the same amount of HE and the 85mm D-44 gun would have meant a vast 20 tonne amphibious hull. The hull is meant to be submerged where it's safer (HEAT rounds of the time detonated when they hit the water and no light tank armour would stop the 90mm guns then in use) so the turret is tiny to limit its target profile - and thus the hull size is less important. A large hull is vital for a swimming tank and this also mandates thin armour because weight has to be kept down. The radio and so on was placed low, below the waterline where they were safe. As it was in effect a self-propelled gun it didn't need much vision equipment, far less than even much earlier reconnaissance tanks and even less that the contemporaneous T-55. The big hatch was designed so that the turret crew could escape wearing breathing gear or life vests.

So, the PT-76 wasn't a light tank/reconnaissance vehicle and when used in these roles it failed abysmally. It couldn't fight other tanks and it couldn't see anything to be any use. The BMP, BRDM and similar vehicles filled that role instead where they perform(ed) well. When the PT-76 fought actual light tanks such as the M41 Walker Bulldog it generally was destroyed before it could get a shot off or was even aware of the enemy. In fact the soviets only put stabilisation on the gun when it was shown that it had trouble hitting beach targets in any sort of swell.
Right, enough of the essay on what it is.

Where would you see this thing?
Well, unless it's pressed into service as a gun tank like so many specialist vehicles often are with "mixed results" (ie: a death trap) it is strictly a fire support vehicle. It's best function is if you imagine it as a direct fire artillery piece with the pathetic armour and vision that entails. By the time the Twilight War starts it's strictly used by naval infantry and only they have stockpiles of its rare ammunition so it's only where they are. Each vehicle should have a section/squad of troops that accompany it as it's relatively blind and they keep infantry and their nasty RPGs away from it. If any sort of armour is in the vicinity these things immediately retire, they have no business even fighting M2 Bradleys or even lighter reconnaissance vehicles. It can be considered to have no effective armour.

Is it any use?
Well, yes and no.
For the fighting that goes on in the Twilight War it is very good in that it can get across the demolished infrastructure. It doesn't need a bridge and this should not be underestimated as to how important that is. A good example is WW2 IJA tanks that were light to the point of uselessness in opposition to anything with a gun but they could get places where anything with a gun couldn't, meaning they were often very handy indeed. The PT-76 can appear in a lakes district or riverine area and rain down HE from outside of HMG or RPG distance. A careful enemy can utilise one to manouevre into a spot to whack a strongpoint with an HE round or two and then get it out before it's wrecked.
Otherwise it's only good for carting stuff around.
Consider this when considering it for an AFV; the commander's sight is not slaved to the gunsight. This means the commander/gunner has to use two sights, one to acquire a target and then one to engage it. As these sights might be pointing in different directions and the gunner's sight is of a narrow focus there might be a lot of hunting around to engage a moving vehicle that will likely result in the vehicle's destruction. The crews know this all too well.