442nd Siege Battalion

The 442nd Siege Battalion was a unit of clone troopers within the Grand Army of the Republic. They, as their name implies, were skilled in besieging enemy fortifications.

For some reason, their armor was identical to the armor of the 7th Sky Corps' clone troopers. This may indicate that they were a part of the 7th Sky Corps.

During the Clone Wars, they were sent to aid in the capture of Cato Neimoidia, a key Trade Federation stronghold.

Behind the scenes
It is possible that this unit takes its designation from the 442nd Regimental Combat Team, a highly-decorated unit of U.S. Army Rangers consisting mostly of Nisei volunteers. These Japanese-American soldiers earned many honors fighting in brutal close-quarters and mountain combat in Italy during WWII.