@Cirrus Light  
Roger that.
 
What made me suspicious is how large the humantech is. Especially that jet. That thing is significantly bigger than I would’ve expected.

@DragonWraith  
Oh, I see. I’ll run a little analysis on Rarity (see what I did thar?). She might be a bit too big. I’ll fix it if she is.
 
The human tech isn’t based off of her, though, it’s based off of the Twi, and thus the pony world chart, so Rarity’s size being off would have no effect on human tech scale.
 
EDIT: Ninja’d.
 
I probably made a mistake because I wasn’t careful about how her ducked head changes her height. I took it into account - a pony is 40 pixels tall (Twilight) - but I just eyeballed it to 35 pixels instead of being super careful. I’ll re-do it more carefully and see if anything changes.
 
Everything else here is pretty exact, though - carefully calculated.

@Cirrus Light  
But the image you use for Rarity is slightly larger than the image used for Twilight, so something is off.

@DragonWraith  
@Dracorex
 
Read the description :p
 
I linked this there, and it mentions it in the image. It’s all based on ponies being roughly a meter (98 cm).
 

@Background Pony #8994
 

 
Looks to be a little bit smaller than the tantibus. 2 sirens tall as opposed to 2 1/2.

@Background Pony #8994  
That’d be difficult to tell, as there’s nothing really to scale it against.

So how big was the energy alicorn the girls used at the end of rainbow rocks to defeat the sirens compared to all of these?

@Background Pony #CA55  
Yes, they should be.  
Though it wouldn’t be much use, because we have no idea how tall EG “humans” are, what with their freakishly long legs and stuff.

Shouldn’t a guy and girl from Equestria Girls also be present for human size comparison?

@Cirrus Light
 
So that makes Twilight about 75 cm/2’ 6” tall? (I’m probably screwing up the math on this.)
 
At least this gives me an idea of how big Equestrian fauna are in comparison to those of Earth’s prehistory, which I know like the back of my hand.

@ZORDON  
Who said anything about us not getting nukes? And besides, when is a war ever “fair”?

@Background Pony #C4F1
 
Well, if we don’t get nukes, they don’t get reality altering. It’s only fair. If that’s not the case and nukes and reality altering is a thing, it depends on who goes first and with what info. Then again, their magic might not work here, and our weapons might not work there.

I’m a bit dubious about the scale of the human tech, because the Rarity standing on top of the Abrams tank seems about 10-20% larger than she should be (she should be about the same size as pre-alicorn Twilight).

@DragonWraith  
There she is!

@Prince Artemis  
She’s that little blue speck on the tantibus’ mane, in front of Torch’s nose.

@ZORDON  
Well I guess… Its not like they can crash the moon into us or something or that discord can distort reality on a whim, right? … Oh wait.

What this needs is that giant magic alicorn from Rainbow Rocks! :P

Imagine them next to an Iowa or Yamato-class battleship.

With all these different vehicles used for size comparison (like the tank and the space shuttle), I am reminded of one thing:  

@Scpx  
DeBeers owns about 80% of the world diamond market, they keep the price high by deliberately limiting supply (a condition known as ‘Artificial Scarcity’). This is similar to how OPEC can manipulate oil prices by limiting their output (or increase it in order to force prices down to eliminate their competition like they’re doing now, in May 2016).

@Cirrus Light  
Oh gosh, I just thought of something on this thread…
 
General: “Okay, as part of some humanitarian and relationship-building exercises, we’ll be stationing a brigade in Equestria, and they’ll be joining forces with us heavily. We’ll be teaching them to use our medicine, build and repair our vehicles, training them to, and helping them, fight the monsters in their territories.
 
“Now, remember whoever’s assigned there will probably be stationed there for some years due to how the portal works. It’s a hard sacrifice and a long job. These operations will have heavy relations with the Equestrian populace.”
 
Col. A: “I volunteer my regiment to deploy overseas and do this.”
 
Col. Sanders: “No, he has multiple batallions busy with the South China Sea exercises, clearly, mine is better suited.”
 
Col. B: “Coming from the colonel in charge of African ISIS presence!”
 
Col. Sanders: “We’re the most experienced with operations in Africa.”
 
Col. C: “My troops are experienced with the international winter training exercises in Scandanavia, they’re well-practiced with populations more akin to Equestrians. Clearly they’re the best-suited.”
 
Col. D: “It’s important for our brigades to be well-rounded, and mine is in need of more training in this regard. I advise sending mine.”
 
Fighting over who gets to work amongst the adorable, cheery mares intensifies

Wow, impressive work!  
zooms in to look at everything

This makes me wanna see a Giant Sweetie Belle.

@Background Pony #42AC  
To be fair, there were CIA reports of WMD’s. And if it were that straightforward then it would’ve just been an invasion, but instead we ducked out too quickly, and now ISIS.
 
Oh boy, here we go…
 
EDIT:  
USA look at Equestria’s oil deposits and be like: Yo Equestria, you gonna tap that?  
…Bronies look at Equestria’s mares and be like: Yo Equestria, you gonna tap that?

@Cirrus Light  
I think Equestria may have some un-tap oil desposits. Sees the U.S. looming in the distance.