Operation Hagel (オペラーション:ハーゲル Operāshon: Hāgeru?) (German for "hail") was a military operation to recover Olympus Spaceport from the Neo-Third Reich Division in ES 591. It was a joint effort between LADDER and the other three Martian factions, the Mars Kingdom Parliament, Mars Front der Befreien (MFB), and Mars Republik Heer (MRH). While successful, it also saw the appearance of the powerful and mysterious Künstler, Frau X, later revealed to be Erica.