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Model number: RX-121
Code name: Gundam TR-1 [Hazel]
Unit type: prototype testbed mobile suit
Manufacturer: Earth Federal Forces
Operator: Tetsushirou Senichi
First deployment: 0015 EC
Accomodation: pilot only, in standard cockpit in torso
Dimensions: overall height 18.1 meters
Weight: empty 41.5 metric tons; max gross 63.0 metric tons
Construction: titanium alloy on semi-monocoque frame
Powerplant: Minovsky type ultracompact fusion reactor, output rated at 1420 kW (+390 kW)
Propulsion: rocket thrusters: 14,000 kg, 2 x 22,000 kg, 2 x 12,500 kg, 4 x 1,000 kg
Performance: unknown
Equipment and design features:
• sensors, range ? meters
Fixed armaments:
• 1 x beam saber, mounted on backpack storage rack, hand-carried in use
• 2 x dual shield booster, 1 mounted on each arm
Optional fixed armaments:
• multipurpose launchers
Optional hand armaments:
• beam rifle, power rating unknown
Remote weapons:
• none
Note:
• The RX-121 Gundam TR-1 [Hazel] is a functional test machine. Although it's a test machine, it was developed for use in real combat, so its basic movement systems are the same highly reliable ones used in the GM series mobile suits. Its beam rifle is a prototype version of the energy pack type which the next generation of machines are expected to carry, and this machine has also been used in the development and testing of other devices such as the shield booster.

The Hazel has been equipped with a Gundam head in order to test its psychological effectiveness against Zeon forces. Although it has the head of the legendary RX-78-2 Gundam, the mobile suit itself is based on the RGM-79Q GM Quel rather than being newly constructed as an RX type. While this machine uses the basic frame of the GM Quel, many of its parts have been replaced with enhancement parts like the new backpack, the movable booster pod attached to it, and the improved thrusters in its legs. As a result, its potential rivals that of an RX type.