Alyona is a Stalker - she risks her life frequently in search of loot in Moscow, or the Dead City, as some call it. After finding a mortally-wounded friend in Dry Station, they stick together until an anomaly whisks them from the Metro to Equestria.
Ortalians are the perfect soldiers, but do not hesitate to bolster their ranks with a wide array of mechanized units. Executioner-class mech is but one they employ to annihilate Empire's enemies. Then Discord happens and steals a mech.
A group of misfit Chimera are transported to Equestria after the Battle of London. What do? Attack the royalty, that's what. To be honest, she started it.
A partial Ace Combat: Assault Horizon crossover. A Russian MVD Spetsnaz team find themselves in the wreckage of their Mi-24... Without a clue as to where they are, they will find that they are not alone, and under attack from everything around them.
A S.T.A.L.K.E.R, SoC crossover. When a STALKER named Valera gets the call to investigate a strange Anomaly, he figures it will be a simple job. Nothing could go wrong with just looking at it, right?