Appo

"The platoons are in the formation you've requested, General. Should I send them to support Captain Rex?" "I'll give the order when I give it, Sergeant Appo."

- Appo and Pong Krell, during the Battle of Umbara

Appo, designated CC-1119, was a clone sergeant who served with the 501st Legion during the Clone Wars. He participated in the Battle of Umbara, one of the war's most lengthy campaigns.

Appo was loyal to his commanding officer, even when placed under the command of Pong Krell, a Jedi Master who was known to be both ruthless and reckless. Nonetheless, Appo showed that his loyalty to his brothers and the Republic still came first as he did not hesitate to open fire upon Krell when he learned that the latter was a traitor.

He was later promoted to the rank of Clone Commander and placed in command of half of the 501st, who were stationed on Coruscant, while Rex led the other half of the unit in the Siege of Mandalore.

Equipment
Appo wore Phase II clone trooper armor painted with the standard blue markings of the 501st Legion, with the only sign of customization being the white arrow pointing down the midsection of his helmet.

The General
"All units, move out!"

- Appo, ordering his men to attack the Umbaran airbase

During the Republic's assault on Umbara, Sergeant Appo was placed under the command of Pong Krell. Alongside the general, he witnessed Rex and his troops helplessly attempt to destroy a heavily shielded Umbaran Mobile Heavy Cannon. Appo suggested that his platoon should move out and reinforce Rex's, but Krell rejected the request. After Rex's platoon was able to take out the enemy forces, Krell ordered Appo's platoon to move out and take the Umbaran airbase.

Plan of Dissent
"General Krell would like to see them in the tower."

- Appo to Rex, regarding Fives and Jesse

After Jesse and Fives returned from their attack on the Separatist Supply Ship, Appo, flanked by two Clone troopers, appeared and informed them that Krell wished to see them immediately. He was in charge of escorting clones Jesse and ARC TrooperFives to execution per orders of General Pong Krell.

Carnage of Krell
"Captain, we've repaired the transmitter. It looks like it was sabotaged. We received a message from General Kenobi. His forces have captured the capital but the remaining Umbarans are heading here." "Get eveyone on the perimeter! We need to prepare for a full scale attack!" "Yes, sir!"

- Appo and Rex

Appo was present during the execution of ARC trooper Fives and Clone trooper Jesse. Appo, similar to Clone trooper Dogma, did not object to Krell's decision to execute the troopers. However, unlike Dogma, Appo obeyed Rex's orders to remove Fives' and Jesse's handcuffs when the execution squad missed intentionally, unwilling to carry out the execution.

Appo later accompanied Rex, the 501st, and the 212th Attack Battalion in arresting Krell, who was discovered to be a traitor. Appo stood alongside the newly freed Jesse when their group entered the control tower to arrest the Jedi Master. However, despite being outnumbered and outgunned, Krell managed to fight his way out of the base. After the Jedi Master's eventual capture, Appo informed Rex that Krell destroyed the communications system and that all remaining Umbaran forces were heading to retake the airbase. Rex ordered Appo to get all troops to reinforce the perimeter.

Order 66
Late in the war, Anakin Skywalker lent half of the 501st Legion to his former padawan, Ahsoka Tano, in her campaign on Mandalore to capture the renegade Sith Lord Darth Maul. With newly promoted Commander Rex in charge of this division, Appo was also promoted to commander to lead the other half of the 501st that accompanied Skywalker to Coruscant. When Chancellor Sheev Palpatine issued Order 66, Commander Appo and his men joined Skywalker in attacking the Jedi Temple.

Behind the scenes

 * Appo's unique white arrow customization on his helmet refers to Appa, a character from Avatar: The Last Airbender, a show that Dave Filoni worked on.

Star Wars: The Clone Wars

 * "The General"
 * "Plan of Dissent"
 * "Carnage of Krell"