Dat MK I.

Mark IV? No, that is almost definitely a Mark I. Note how long the gun is, only Marks I-III had those.  
-And then there is also this➡

@Flying Pancake  
And right they are. SABOT’s a real thorn in the side. And out the other :p

@Cirrus Light  
Oh, yeah, modern tanks fire much faster projectiles. The Abrams main gun apparently has a muzzle velocity of somewhere between 1580 to 1750 m/s, I’m assuming depending on ammunition type. (Compare to Tiger II at 1000-1130 m/s). They’re also tiny, relative to the diameter of the barrel:  
 
The idea being that a very fast, very hard, needle like projectile will be able to penetrate armor more effectively than a larger-diameter one.

@Flying Pancake  
WWII probably had the greatest recoil/weight ratios. As the years went on, though, I think weapons designs started favoring higher speed projectiles over higher mass; keeping energy constant, this reduces momentum, at the same time certain tank designs got heavier. The M1 Abrams is a lot heavier than the Shermans were (though to my surprise, actually slightly lighter than the Tiger II).

@Cirrus Light
 
I can buy that rationale; That particular group of nerds just happened to be pretty terrible at driving there, though.
 
 
For oversimplified back of the envelope physics:
 
A 10.4 kilogram shell moving at 1000 meters per second impacts a tank weighing 19 metric tons and doesn’t penetrate. Assuming the shell stops moving completely when it hits, I figure the tank ought to leave the collision moving at a little over .54 meters per second. So yeah, it’s probably moving a little fast but not totally ridiculous.
 
Unless you’re talking about the whole “sci-fi impenetrable crew compartment and safety shells” thing. The physics are probably pretty sketchy on that one, but the show would be way less fun without it.

@Flying Pancake  
I’m not so sure that physics-s correctly :p
 
But maybe.
 
Nerds are fine at operator skills though. Especially gamers. Just not physically intensive things. Which some vehicles can be, but generally not nearly so much as infantry stuff.

@Cirrus Light  
Eh, you’ve got to do more than just give them a vehicle. Otherwise…  

@redweasel  
Oh, lol. This is why they shouldn’t ever put nerds on the front line.
 
Unless they’re operating vehicles :q

@Cirrus Light
 

@redweasel  
Wat?

take that, hoofy kicks!

@Cirrus Light  
Agreed.

Pinkie Pie: (to herself) I will protect all smiles. (to her troops) Lucky Sevens! Keep going! Show Sombra we mean business!

@TheMultiBrony21  
“I… lost my way.”
 
One of the best character arcs in that game.

They may be absurdly impractical and horrendously outdated, but, man, WWI British tanks have got to be some of the coolest looking AFVs ever built.

Just don’t swear. She doesn’t like it when you swear.