#prewar

UC 0074

The EFSF convert their vessels' main armaments from shell-firing cannons to mega particle cannons.

In February, Zeonic complete the MS-04 Prototype Zaku.

December, UC 0074

The first Jupiter Energy Fleet returns to the Republic of Zeon, rendering the nation energy independent from the Earth Federation.

Zimmad submits the design of their EMS-04 Zudah to Zeon’s military.

Zeonic completes the first prototype YMS-05 Zaku, later renumbered MS-05A.

UC 0075

Zeonic’s Zaku and Zimmad’s Zudah are trialled against each other to determine which will be adopted as the Zeon military’s mainline mobile suit. The Zaku underperforms compared to the impressive Zudah, but the Zudah’s reactor overheats and explodes, destroying the mobile suit. The Zaku is chosen for its reliability and lower production cost.

In May, Zeonic rolls out the MS-05B Zaku 1, Zeon’s first combat-ready mobile suit.

In July, Zeon commissions the Musai-class space cruiser, the first warship in history designed to carry mobile suits.

UC 0076

In March, Zeon commissions the Gwazine-class battleship, a command ship for their highest-ranking officers.

In April, Zeon begins mass-producing the MS-05B Zaku 1 after widely expanding their mobile suit factories.

In May, Colonel Kycilia Zabi creates the Mobile Training Battalion to train mobile suit pilots and establish mobile suit tactics.

In December, Zeon begins development of specialized mobile suit variants, especially for terrestrial and maritime warfare. A high-performance "R-type" Zaku is also proposed.

UC 0077

In April, the Riah Revolution occurs at Side 6. Zeon military backs the nationalist faction, sending a squad of Zakus to blockade the EFF, helping to secure the revolution’s victory. Side 6 declares independence from the Earth Federation as the Riah Republic.

In August, Zeonic rolls out the MS-06A Zaku 2. Its performance is greatly improved over the Zaku 1, but Kycilia Zabi orders it redesigned to be better equipped for melee combat, expecting that the Federation will eventually develop their own mobile suits.

In September, per Kycilia's orders, Zeonic rolls out the MS-06C Zaku 2.

UC 0078

In January, Zeon begins mass-producing the Zaku 2 C-type, replacing the Zaku 1 as its military mainstay.

In February, the EFF's SCV-X project begins construction of SCV-27A, a carrier for the FF-S3 Saberfish fighter.

In March, the EFF commence the RX Project, though the Federation at large dismisses the threat of Zeon's humanoid weapons and remains skeptical about developing their own.

In September, Zeonic rolls out the MS-06F Zaku 2. This version lacks its predecessor's heavy radiation shielding, making it lighter and in turn granting it better performance. The commander-use S-type is later developed, based on the nimble F-type.

In October, as part of Zeon's preparation for a possible Earth invasion, Zeonic rolls out the MS-06J Zaku 2. It is closely based on the F-type, but lacks rocket thrusters to further reduce its weight.

On October 24, the government of Side 3 rechristens itself as the Principality of Zeon and declares independence from the Earth Federation.

In November, the Principality of Zeon begins national mobilization. Supreme Commander Gihren Zabi divides the military into the Space Attack Force, under Vice Admiral Dozle Zabi, and the Mobile Assault Force, under Vice Admiral Kycilia Zabi.

In December, the Principality of Zeon begins the lengthy production of the Dolos-class, a trio of massive warships capable of carrying a staggering 182 mobile suits.