TJ-55/Legends

This tactical droid was a battle droid in the Confederacy of Independent Systems's Droid Army during the Clone Wars. In 22 BBY, he was stationed on Christophsis after the Confederacy invaded the planet. Soon after the invasion, the Galactic Republic sent a GAR detachment, lead by Jedi Generals Obi-Wan Kenobi and Anakin Skywalker. During the fighting between GAR and Separatist forces, the tactical droid led an ambush of the Skywalker's and Kenobi's forces at the North and South towers of Crystal City. As the remaining Republic forces tried to evacuate from the roof of the South tower, the tactical droid attacked the retreating clone troopers, followed by a group of B1 battle droids. However, during the fighting, the droid's head was ripped off by a clone trooper Gus and was brought back to the Republic's base for a robolobotomy for stolen inteligence. However, the robolobotomy revealed nothing except to confirm that there was a traitor among the Republic's troops. The traitor was eventually revealed in the form of Clone Sergeant Slick, who was later apprehended.

Biography
During the Clone Wars, this tactical droid served as a commander in Separatist Droid Army. In 22 BBY, he was assigned to the planet Christophsis, which had been previously captured by Confederacy of Independent Systems. The planet inhabitants vainly tried to withstand the droid forces, but were greatly outnumbered. They then asked the Jedi High Council for assistance. Republic dispatched clone troopers, led by General Obi-Wan Kenobi and General Anakin Skywalker, to liberate Christophsis. After landing, the Jedi planned to ambush the tactical droid's forces, while they were marching into Crystal City. Republic set up several repeating blaster cannons on the North and South towers of the City, and prepared to open fire to the droid forces as they past through the city plaza below.

However, the Separatists had a spy, Clone trooper sergeant Slick, who had become disillusioned with what he believed to be the Jedi's use of the clones as a slaves and cannon fodder. He had leaked the information about the planned ambush to the Separatist's commander and Dark Acolyte Asajj Ventress, who then gived the message to General Whorm Loathsom, who 	proceeded it to the tactical droid. Consequently, by the time the droid led his forces to the City, he was well aware of the presence of Republic's troops. He commanded his B1 battle droid forces from his Armored Assault Tank, and surprised the Jedi and clones by splitting his troops, thus bybassing the ambush. Two squad of battle droids then attacked to south tower, were General Kenobi was with his troopers. The Jedi Master and his clones were pinned down, but Skywalker, who was in north tower, signaled a gunship for an evacuation, and then led his clone troopers to help Kenobi along the cables. Republic forces were able to retreat, and took an elevator to the roof, where gunship was landing. While they were attacked by a squad of battle droids, the tactical droid, who had left his tank, led a second squad of battle droids to attack, in order to prevent the retreat of the Republic troops. Equipped with an E-5 blaster rifle, he managed to shoot at least one clone trooper. However, trooper Gus saw the droid, jumped for him, ripped his head off and leaped onto the departing gunship, believing that the head would reveal how the droids knew their positions. While the gunship leaved, the body of tactical droid waggled senselessly, shooting few pointless shot. Later on Republic command center, the tactical droid's head was putted to robolobotomy, but it only confirmed that the Separatists had gained information about the positions of Republic ambush squad. The head then scorched, and disabled permanently, defacing any changes of further analyses. However, after some investigation by Clone Commander Cody and Clone Captain Rex, the traitor was discovered to be Sergeant Slick, and he was apprehended. After a duel with Asajj Ventress, Skywalker and Kenobi discovered the full strength of the Separatists forces, as they had planned a full-scale invasion and conquest of the planet, and the tactical droid was replaced by another. Under the command of General Loathsom, the Separatist forces attacked, but were eventually defeated.

Behind the scenes
The word "TACTICAL" is written along the side of the head of this tactical droid in Aurebesh.