Technology & Combat Characteristics
A modified AMS-119S Geara Doga Kai developed by Strategic Naval Research Institute (SNRI) in corporations with Buch Junk Inc. as aggressor unit for Earth Federation Forces' (EFF) Instructor Corps. It was not manufactured by EFF itself due to to political reason and Anaheim Electronics' intellectual property, instead SNRI outsourced its development to Buch Junk Inc. by copying the captured units and develop it as part of their own Mobile Suit development project. Thanks to that they are capable to "produce" their own Geara Doga type mobile suit, but it was never officially adopted by the EFF. Its model number was not changed and it was commonly referred to as the Lehr Doga to avoid confusion with its predecessor.
Due to the Lehr Doga being based on Neo Zeon technology, it was modified with RGM-89 Jegan parts, primarily the leg units for parts compatibility and ease of maintenance. The Lehr Doga also made to be highly modular, primarily the backpack, waist armor, and shoulder armor are highly modularized and can be swapped out with multiple units, regardless of whether they are for the Federation Forces (Titans) or Zeon mobile suit parts. This is to mimic the enemy units’ characteristics, like the AMX-011 Zaku III and AMX-014 Doven Wolf, as much as possible to facilitate training. In terms of generator output it was equipped with AMS-119 Geara Doga type reactor on early models, but since U.C.106 its generator had been upgraded with AMX-011S Zaku III Custom type. Thanks to such modifications, it turned the Lehr Doga into a high performance aggressor mobile suit, while also heavily customized depending on its pilot preferences, such as the one used by Charles Rochester.
History
In U.C 0115, a Lehr Doga was deployed alongside RGM-87C2 BR-GM during a terrorist attack on Side 2 Amelia by Zeon Remnants. This unit piloted by Li Shaomei and serve as reinforcement for the Fastest Formula Corps' ship the Space Ark-class Fairlady after it was damaged by Zeon Remnants' AMA-01X Jamru Finn.
Later in U.C 116 some of the Instructor Corps' Lehr Doga was assigned to protect the siege of Trimurti Anti Asteroid Cannon by Zeon Remnants "Legacy Fleet". One of unit was piloted by Charles Rochester spearhead for Trimurti defense force. Fortunately the arrival of Fastest Formula (FF) manage to turn the tide of battle, while Charles' unit served escort unit for F90 Gundam F90 PV Type against RF Gromlin II.
U.C 120 one Lehr Doga unit was assigned to Earth Federation Forces' Ra Cailum-class, Admiral Tianem, served as 13th Experimental Squadron's aggressor unit, and piloted by Sid Amber. During the invasion of Oldsmobile Forces' Olympus Mons fortress on Mars, it serve as the escort for F90 Gundam F90 Unit 1 and RGM-89ST2 ST-Gun, but was ambushed by the Oldsmobile Forces and lost the ST-Gun the the process. Sometimes later, it escorted the F90 Gundam F90 A.D.S Type during the siege of Olympus Mons fortress, but unfortunately it was ambushed and destroyed by OMS-90R Gundam F90.