After they landed and overtook the Umbaran's initial position, command of the 501st was given to Jedi General Pong Krell when Anakin Skywalker was called back to Coruscant by order of the Jedi High Council. In 20 BBY, Jesse was with the 501st when the Galactic Republic launched their attack to retake Umbara. ' That's why they're called the Shadow People, Tup!' вЂ•Tup and Jesse When Republic forces converged on Grievous, Jesse and his squad tried to shoot down a shuttle that was trying to pick up Grievous, but they failed to stop Grievous from escaping. Jesse was left in charge of the squad, and they continued through the wetlands to rendezvous with Jedi General Obi-Wan Kenobi and Clone Marshal Commander CC-2224 'Cody' and their forces. There, they met a Twi'lek woman named Suu, who allowed them to leave Rex there to recuperate. Jesse riding his BARC speeder on Saleucami. When Rex was wounded by a pair of commando droid snipers, Jesse saw that they were on farmland and decided to take Rex to the farmstead for shelter and medical attention. When the 501st landed with the 7th Sky Corps's 212th Attack Battalion on Saleucami to track down Separatist General Grievous, Jesse traveled with Captain Rex, Kix, and Hardcase on BARC speeders. Д«y the time of the Battle of Saleucami, Jesse had achieved a military rank higher than that of CT-6116 'Kix' and Hardcase. Jesse: ' Easy with that weapon ma'am, we're here as friends.' Suu: ' State your business.' Kix: ' Our captain has been hurtвЂ“' Suu: ' I'm no doctor so justвЂ“' Jesse: ' We have a medic ma'am, we just need a place to tend him overnight.' вЂ•Jesse and the other clones meet Suu Lawquane. Tano and Rex buried Jesse alongside his men, and used their helmets as grave markers. Despite the lieutenant's efforts to carry out the will of the Sith Lord Darth Sidious, Tano and Rex both survived by escaping from the Star Destroyer as it crashed on a moon, resulting in the deaths of Jesse and the other clones.

In the ensuing skirmish aboard the Venator-class Star Destroyer Tribunal, Jesse took command of the division and demoted Commander Rex for refusing to execute Tano. He served with the former Jedi Commander Ahsoka Tano during the Siege of Mandalore, but then turned against her as a result of his secret programming which compelled him to comply with Order 66-the command to exterminate the Jedi Order for treason. Jesse joined the 332nd Division, a detachment of the 501st created by Skywalker and led by the newly-promoted Clone Commander Rex, shortly after the Battle of Yerbana. By the time of the Battle of Anaxes, Jesse had joined the ranks of the Advanced Recon Commandos and was outfitted with Phase II ARC Trooper Armor.

Jesse was spared by his fellow clones, however, while Krell was revealed as a traitor to the Republic. He was proud of his service in the Republic Military, wearing the Republic crest as a facial tattoo and on the helmet of his clone trooper armor.ДЄs a trooper in the 501st Legion, Jesse served under the command of Jedi General Anakin Skywalker and Clone Captain CT-7567 'Rex.' He also served under another Jedi officer, General Pong Krell, who ordered Jesse's execution alongside CT-5555 'Fives' for disobeying his orders during the Battle of Umbara. Driven by a sense of patriotism, Jesse was a loyal soldier who fought hard to defeat the enemies of the Galactic Republic. Like all clone troopers, he was bred from the genetic template of Jango Fett and trained to serve in the Grand Army of the Republic. ' Still got your sense of humor, I see.' вЂ•Fives, to Jesse Д¬T-5597, nicknamed ' Jesse,' was an Advanced Recon Commando and Clone Lieutenant who served in the 501st Legion during the Clone Wars.

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