Kursk

"It was 1987. Separatists had hijacked a Soviet missile silo in Kursk, and launched an ICBM at the United States"

- Hank Pym to Hope van Dyne

Kursk was an Oblast, or province, in the Russian SSR of the Soviet Union.

History
In 1987, a group of separatists seeking independence from the Soviet Union took control of a Soviet Intercontinental Ballistic Missile, and launched it at the United States. In response, S.H.I.E.L.D. tasked Hank Pym and his wife, Janet van Dyne, to disable the rocket before it hit its target. The missile's body was shelled by solid titanium, meaning that one of the two agents had to disable their Pym Particle Regulator and shrink between the molecules to access the wiring inside. Despite the fact that Pym was about to do that, Janet took the initiative and shrunk into the Quantum Realm to destroy the missile.