This is a list of military terms and events used in the Evangelion franchise.
A-801 Order[]
An A-801 Order was a code issued by the Japanese government (under the influence of SEELE) that removed legal protection and authority from NERV in The End of Evangelion. This allowed the Japanese government to have the military invade NERV HQ to "prevent" Third Impact (but they helped ironically cause this event).
It seems any order starting with "A" seems to be related to NERV and emergencies.
The now-defunct Evangelion website NERV.ORG has a message on its homepage which reads "This site has been closed because of A-801."
Katsuragi Expedition[]
The expedition lead by Misato Katsuragi's father, Dr. Katsuragi, to the South Pole to research and experiment with Adam - the being that was found there. It was funded by SEELE to set in motion their plans. Resulted in Second Impact.