In this blog I've collected all the known Rebel Echo Base Troopers who actually participated at the Battle of Hoth at the battlefield. Characters such as Cal Alder also fought during the battle, but were not present in the trenches to face the AT-AT Walker. For the pilots of Rogue Group, visit my pilot blog.

Onscreen
# Vildar Blin: Bearded scout and manned a Mark II Medium Repeating Blaster. Was killed when a fallen AT-AT Walker was blown up.
Source: CCG - SW Insider

# Sergeant Major Trey Callum: Received a call from station 3T8 and reported to the Echo Base. Was killed shortly after the warning.
Source: CCG

# Sergeant Reye Hollis: One of Firest's top Sergeants. Received several rewards for his heroics. The only Sergeant of Firest who survived the Battle of Hoth.
Source: CCG - SW Insider

# Jess Allashane: Another trooper that fought in the battle.
Source: CCG

Mentioned, but not (yet) seen in the movie:
# Colonel Firest: Was the highest commanding field officer during the Battle of Hoth.
Source: Galaxy Guide 3

# Major Dervis: Was a commanding officer during the battle.
Source: Inside the Worlds

# Corporal Maren Kelsome: Reported the first sight of AT-AT walkers at station 3T8. A Walker killed him and his Tauntaun.
Source: Galaxy Guide 3

# Dice Ibegon: Florn Lamproid. Got killed during the battle of Hoth
Source: Tales from Mos Eisley Cantina

# Lak Sivrak: Shistavanen and partner of Ibegon. Outlived her to fight once more during the Battle of Endor.
Source: Tales from Mos Eisley Cantina

# Corporal Maer: Was capable of firing an Atgar P Tower.
Source: Decipher TCG CG Image

# Corporal Delevar: Medic and scout, was also part of Rebel Strike Team on Endor.
Source: CCG

# Corporal Kensaric: Scout, served under Bren Derlin. Was also part of the Rebel Strike Team on Endor.
Source: CCG

# Lieutenant Judder Page: Also fought in the battle, but was not seen in the movie
Source: Rebel Era Sourcebook

# Corporal Jobin Mothma: The son of Mon Mothma, died defending Echo Base. He spoke the words "Imperial Troops have entered the base".
Source: Visionaries.

Voren Na'al: Alliance Historian. Was able to escape the trenches.
Source: GG3

# Roj - Sola - Jielu - Grond: Troopers addressed by Corporal Jobin.
Source: Visionaries

Unknown recognisable Troopers:
# Trooper who fired an Atgar P-Tower (Vintage 'Rebel Trooper')

# Officer who shouted "Come on!" when a Walker had been tripped by a power cable. Could this be one of the Commanding Officers like Ledick Firest or Major Dervis?

# Officer (far right, Vintage Rebel Commander) played by matte artist Harrison Ellenshaw. He was dressed as a field officer so there is a chance he might have actually fought in the trenches. Left officier is also unknown, officer in the middle is Shawn Valdez (played by Joe Johnston).

# More Troopers with a proper name would always be welcome, of course ...