Swamp troopers, known informally as mudtroopers, were a type of Imperial Army trooper used by the Galactic Empire that existed outside the Stormtrooper Corps.
A mudtrooper helmet and oxygen mask
While the Imperial Naval Academy of Carida primarily trained Imperial cadets as Imperial Starfighter Pilots, cadets were also issued with Swamp trooper armor and underwent training as Swamp troopers including wading through swamps, trenches and running up mountains. Imperial naval cadets deemed to be insubordinate such as Han Solo were often reassigned to infantry duty as Swamp troopers.
The swamp troopers of the 224th Imperial Armored Division fought on the swamp planet of Mimban during the Mimban Campaign, which saw the Empire battle forces of the Mimbanese Liberation Army for control of the planet and its vital resources. Solo served as a swamp trooper before deserting with the Wookiee Chewbacca to join Tobias Beckett's gang.
Swamp trooper Wesger Odry
Swamp troopers were a type of Imperial Army trooper that existed outside the Stormtrooper Corps. Standard troopers were denoted by a red bicep band. Medics fought alongside standard swamp troopers, and they could be identified by a white bicep band on their right arm.
Swamp troopers were equipped with helmets and chest plates similar to those of Imperial officers' battle armor. Due to the often hazardous nature of the various worlds the Empire found itself subjugating, troopers wore goggles for eye protection and oxygen masks to filter out potentially deadly substances, although swamp troopers did not always wear their masks during battle. Swamp troopers wielded SX-21 pump-action scatter blasters, E-10 blaster rifles, E-11 medium blaster rifles, E-22 reciprocating double-barreled blaster rifles, DLT-19 heavy blaster rifles, and EC-17 hold-out blasters.
Swamp troopers were first officially revealed by Entertainment Weekly on February 7, 2018 during their coverage of Solo: A Star Wars Story Star Wars: Battles that Changed the Galaxy incorrectly describes swamp troopers as being a mix of Army troopers and stormtroopers, when in fact stormtroopers involved in campaigns like the war for Mimban were their own variant, the wet-weather gear stormtrooper.