(U.C. 0079.12.03 - 0079.12.07) With Zeon losing their foothold on Earth, the 603rd is given a new project — to infiltrate a prototype weapon into the Federation airspace and attack Federation warships launching from Jaburo. Ensign Werner Holbein, an arrogant naval officer who boasts a proud maritime family tradition, is assigned to the Jotunheim to pilot the mobile diver unit Ze'Gok. However, the testing goes well below expectation, as both Holbein's test drop ends in failure after unable to score any hit with the Ze'Gok. On the third and final drop, Holbein manages to destroy a handful of Federation ships with a direct reentry/free descent before letting loose the attached "Kuhblume" beam scatter cannon. Before he could celebrate, two Core Booster II fighters arrived and shot down both the Ze'Gok and the retrieving Gaw carrier, killing Holbein in the process.

(U.C. 0079.12.28 - 0079.12.30) Situation for Zeon is getting desperate after the Federation successfully sieges the space fortress Solomon. Upon arriving at A Baoa Qu, Jotunheim is visited by Col. Herbert von Kuspen, a uptight high-rank commander from an elite battalion, who immediately try to assume command of the ship but meets resistance from both Monique and Prochnow. The ship is then reinforced with "Principality's elite soldiers" — turns out to be a group of young cadets forcefully mobilized from the homeland. To Monique's shock, the most enthusiastic soldier out of the inexperienced recruits is nobody other than her own younger brother Erwin. The Jotunheim is then dispatched to lunar space and ordered to test and perfect the Oggo mobile pods. At Granada airspace they run into a small Federation forces, and Erwin leads a squad of three Oggos to engage in combat.