Alien Abduction: When Equestria popped up on Earth, a Chinese cruise ship with 2,000 passengers were taken and turned into newfoals.
Aliens Are Bastards: Subverted. Xenolestia comes off as a complete bitch, but by chapter 7: Stalemate, we have Pony resistance against her and even the Elements of Harmony are doubting her. Justified since Xenolestia is really Queen Chrysalis.
Alien Invasion: Oh no, the Ponies never invaded us... we invaded them.
The Alliance: The United States and the Soviet Union team up to stop the Ponies.
Badass: Ronald Reagan for having the balls to punch a xenocidal leader right in the face.
Badass Army: The American and the Soviet invasion force.
Beat Them at Their Own Game: After losing some men to Ponification potion (having been declared a chemical weapon), the Soviets respond in kind when the request to use VX nerve gas is approved.
Be Careful What You Wish For: During Reagan's term in office, he had several speeches ready in the case of an alien invasion due to seeing as a way to obtain world peace, needless to say he gets his wish.
Berlin Wall: Briefly visited in chapter 3: Escalation, where a patrol squad in West Germany gets ambushed by PER terrorist.
Berserk Button: Mr. Gorbachev is visibly angry when Xenolestia tries to justify the forced conversion of over 2,000 Chinese civilians.
Fighter jets such as the F/A-18, AV-8B Harriers, and SU-24s make appearances.
Likewise for helicopters, we get UH-1 Hueys, AH-1 SuperCorbras, CH-47 Chinooks, Mi-28 Havocs, Mi-24 Hinds, and many more.
Curb-Stomp Battle: Human weaponry destroys the Royal Guard in battle, with Human casualties being incredibly light in comparison.
Day of the Jackboot: Chapter 7: Stalemate reveals the Queen Chrysalis has been in control of Equestria for about a month and a half before making contact with humanity.
Dead Fic: The author has lost interest in writing it.
Deadly Gas: The Soviet forces are given authorization to use VX nerve gas on a large platoon of Royal Guards in chapter 7: Stalemate.
The Deadliest Mushroom: When the Russians nuke the Barrier, the story mentions that ponies not killed outright fall to radiation poisoning many years after.
Death from Above: Human fighter jets are able to outmaneuver even the fastest of Pegasi and shoot them down with ease.
Defcon Five: Averted. After the failed First Contact meeting with Xenolestia, Reagan correctly raises the DEFCON level to DEFCON 2 for Marines stationed in the Pacific and DEFCON 3 for the USAF stationed in Hawaii.
Did You Just Punch Out Cthulhu?: After Xenolestia refuses to agree to peace with Humanity and threatens to potion bomb everyone at the UN meeting, Reagan has finally had enough of her shit and punches her right in the face.
Easily Thwarted Alien Invasion: Except for the UN meeting, the Ponies never once set hoof on human soil and Human forces are already closing in on Canterlot after only a week.
First Contact: Xenolestia meets with some of the most influential leaders of the Cold War... to announce her plan to wipe out humanity.
From Bad to Worse: For Equestria. First, the humans manege to break the barrier, then the two most powerful countries on Earth lead invasions from the west and the east respectively which puts them in a two front war. This should be good.
Gas Mask Mooks: The invading human forces are decked out in full NBC (Nuclear Biological Chemical) gear, which helps great against the potion throwing guards. Though the suits can still be torn by arrows.
Harmless Villain: The Royal Guard get crushed by human weaponry and the only real problems humanity faces are the pony sympathizing PER. Plus, the notable casualties on our side were due to arrogance because some Soviet soldiers were lead into an ambush.
Hazmat Suit: All human forces wear NBC (Nuclear Biological Chemical) gear to protect them from the potion.
Hidden Villain: Only Major Frolov and the real Princess Celestia are aware that Queen Chrysalis is the one responsible for the Humans declaring war on Equestria.
Hold the Line: Most of the Royal Guards stationed in Dodge Junction refuse to give into the Soviet forces surrounding them.
The ponies attempted to fight back, only inflicting minor amounts of damage on some infantry units, as these units were damaged, others would cover them. They were surrounded; one platoon against a division, but to them it didn't matter- Celestia had ordered them to hold, and they would do so with their lives, even if there was no hope for them.
Hopeless War: For Equestria, who are horribly outmatched by the humans in both numbers and war technology.
Hot Line: Prime Minister Gorbachev calls Reagan on the Moscow–Washington hotline to inform him of the Soviet nuclear ICBM about to be launched at the barrier.
Xenolestia: "I want to fix your greed, and your corruption, and fix the mistakes your people have made damaging your lands, for there is still hope! You can take a potion, be free of your greed corruption and blood lust, as well as your physically inferior forms and come to live in Equestria!"
Insufficiently Advanced Alien: Thanks to the barrier being destroyed, the Royal Guard are beaten easily thanks to only being armed with spears and bows and arrows.
It's Raining Men: The VDV are deployed after the Soviets invade Equestria from the east.
Just Plane Wrong: The end of Chapter 5 - Soviet Assault mentions the Yakovlev Yak-40 being used by the Soviet Air Force in the middle of an active warzone. This might be a confusion with either Yak-38 or Yak-(1)41 - and while the the -38 (which was already mentioned in the Prologue) was not a very good aircraft, it was a VTOL plane used from the Soviet Union's aviation cruisers, making its appearance in the south pacific plausible. The other would have been at most in prototype stage at that time (first flight in real life 1987).
La Résistance: Ponies in Equestria provide Intel to the Americans and help them sneak into the Cloudsdale weather factory in the hopes to bring down Xenolestia.
Leaning on the Fourth Wall: In chapter 6, it is mentioned that one of the reasons for critics objecting to the attack on Equestria is that "these aliens looked like something out of a little girl's cartoon."
Refuge in Audacity: Some of the characters still can't believe that America and the Soviet Union pulled an Enemy Mine just to fight some Ponies.
Mager put his hand over his forehead. Ponies.... It felt stupid to part of him, having to team up with the Americans just to fight some dumb ponies. But the other part of him knew looks could be deceiving, and both the Americans and Russians knew that the quicker they wiped that cyka off the face of the Earth, the less problems they would have.
Rock Beats Laser: Averted for the most part, however some Royal Guards and their weapons are able to do some damage:
A very lucky spear throw lands into a Sukhoi SU-24's jet engine, forcing the pilot to eject.
Some raining arrows launched by a squad of Guards tear into Soviet NBC suits and give an opening for the potion to hit.
Save the Princess: Major Frolov captured by the Changelings as a POW finds the real Princess Celestia in the Canterlot caverns, who has been replaced by Queen Chrysalis, and decides to escort her out.
Slave Mooks: Implied to be the case for the Royal Guards.
Sole Survivor: Specialist John Richardson is the only survivor of his patrol squad that was ambushed at the Berlin Wall by PER terrorist.
Soviet Invasion of Afghanistan: Lieutenant Ivan Averin of the VDV is mentioned to have seen action in Afghanistan two years before the Equestrian invasion.
Superweapon Surprise: WMD's, specifically Soviet nukes and VX Nerve Gas, both of which completely devastate the Equestrian military. Surprise!
Sympathy for the Devil: Some characters can't help but feel bad for the Ponies equipped with weapons not used since the times of Ancient Rome getting slaughtered by fighter jets, tanks, and modern infantry.
Take That: With the aliens looking "like something out of a little girl's cartoon", Reagan is amazed that Hasbro hasn't sicked their lawyers on the Equestrian government yet.
Tank Goodness: Want to see T-72s and T-80s? Yup, they're here to.
From the East, Equestria faced the threat of hundreds of Russian paratrooper aircraft and amphibious assault vehicles, all of which were launched the second they received word the barrier had fallen. YAK-38's, KA-25's and Mi-8's were all launched from their ships as they began their massive assault. In the skies above, a fleet of Il-76TD aircraft, belonging to the VDV, were ready to drop thousands of paratroopers deep into Equestria immediately.
Their odds from the West were just as grim, if not more so. Six American amphibious assault ships, two American Nimitz-Class Carriers, one British Invincible class, two battleships, twelve destroyers and an American Air Base in Hawaii only three hundred miles away, with the 101st United States Airborne Ready to deploy. American LCACs were being launched to deploy M1 Abrams tanks onto the shore of Equestria the second they made landfall, Harriers were already bombing positions that were now incredibly exposed after the strike.
War Is Hell: Well more for the Royal Guard. For the humans, its more like hunting season because of how easy their opponents are.
Wham Chapter: Chapter 6: Common Enemy reveals that the real Celestia was kidnapped and imprisoned underground by Queen Chrysalis and the Changelings. There is a reason shes been referred to only as Xenolestia throughout this article.