|Affiliation:|| Robotech Expeditionary Force|
|Type:|| Super Dimensional Fortress|
Shadow Dimensional Fortress
1,240 (refit) m
|Armaments:|| Reflex cannons |
|Defences:||Pinpoint reinforced Omni-directional Barrier|
|Carried mecha:||420 Shadow Alphas, 250 Shadow Betas, 800 Cyclones, 300 Sentinel Mecha, 800 Ghost Interceptors|
|Crew:|| Lisa Hayes|
The SDF-3 Pioneer is the third human Battlefortress to be built and was originally the largest ship to be commissioned by the United Earth Government and the Robotech Expeditionary Force. The SDF-3 Pioneer is the Flagship of the REF and the Pioneer Expedition to the Robotech Masters's homeworld of Tirol in the year 2022.
Although built for the mission to Tirol, the SDF-3 was used before said mission, in 2021. In an incomplete fasion, it was a center point in the first battle of the Crystal War, where non-culture-affected Zentradi began attacking the ship. Kyle Bartley and Max Sterling helped fight off the army, although that was only the start of the war. (Crystal Dreams 1: Crystal Dreams)
In 2042, the SDF-3 was heavily damaged during T.R. Edwards' rebellion against the REF. The bridge of the vessel was damaged by Shadow fighters while the ship's reflex cannons were destroyed by the Invid Regent's Carrier. Several of the crew were injured, including the ship's commanding officer, Lisa Hayes.
The refit SDF-3's first action was over the Invid homeworld of Optera where the ship destroyed a Genesis pit mutated Edwards with a bombardment from its synchro cannons. (Robotech: Prelude to the Shadow Chronicles comic: "The Children of the Shadows")
The SDF-3 and the science vessel Deukalion traveled to the Omicron sector to test fire a Neutron-S missile. During the test, the missile created a black hole, crippling the Deukalion and damaging the SDF-3. Both vessels were aided by the Icarus, which was sent to check on the SDF-3 after contact was lost with the vessel. Due to the loss of the SDF-3's fold drive the Icarus planned to jump to hyperspace close to the SDF-3, engulfing it in its hyperspace bubble. However, the SDF-3 was rammed by an Haydonite warship, preventing it from jumping with the Icarus and sending it back towards the black hole.
The status of the SDF-3 was unknown, though the Haydonites believed that it had managed to escape the black hole and expected it to have retreated back to Space Station Liberty. They were surprised to not find it there when they launched their attack on the station.
- In the Sentinels' animation, a part of SDF-3 shown and it's colored red. In the Sentinel's comic book from Eternity Comics and the cover of End of the Circle, the SDF-3 is depicted as a green ship.