Trey Callum / Legends Trey Callum was a Human male sergeant major of the Rebel Alliance Special Forces during the height of the Galactic Civil War . Formerly a member of the Imperial officer corps , Callum defected to the Alliance to fight the Galactic Empire . Under the overall leadership of Colonel Ledick Firest , Callum commanded a squad of Special Forces soldiers at Outpost Beta on the Echo Base defensive perimeter during the Battle of Hoth in 3 ABY . Callum was the first to report to Echo Base the presence of Imperial All Terrain Armored Transport walkers advancing toward the base during the opening stages of the battle , and he was killed during the first barrage of AT - AT blasterfire . Biography . Trey Callum , a Human male , was originally a member of the Imperial officer corps , but he defected from the Galactic Empire to join the revolutionary Alliance to Restore the Republic . By 3 ABY , Callum served as a sergeant major with Alliance Special Forces at Echo Base , the Alliance High Command headquarters on the remote ice planet Hoth . During the Battle of Hoth , Callum was one of the battle - hardened field officers under the command of Colonel Ledick Firest , tasked with delaying the advance of the Imperial invasion force long enough to buy sufficient time for the base ' s personnel and equipment to evacuate the planet . Callum was in charge of a squad of Special Forces soldiers at Outpost Beta , the outermost sentry post of Echo Base ' s external defensive perimeter . While entrenched near Echo Station 5 - T - 7 , where he was preparing his squad for in - close fighting , Callum received a comlink call from Echo Station 3 - T - 8 , notifying him that forward scout Maren Kelsome had spotted Imperial walkers , and was asked to verify . Although the thundering footfalls of the walkers was enough to tell him that the Imperial invasion force was close , with a shock of recognition , Callum confirmed the presence of around a dozen approaching All Terrain Armored Transports through his TD2 . 3 electrobinoculars . Callum reported back to Station 3 - T - 8 to verify his visual confirmation of the AT - ATs , which also broadcast throughout Echo Base , first announcing the extent of the Imperial ground force . Callum also issued a comlink warning to Rogue Leader Luke Skywalker , in command of Echo Base ' s snowspeeders , of the approaching walkers . Soon after reporting his sighting , however , Callum was killed in the opening barrage of AT - AT laser cannon fire . Although troops rushed to his aid after Callum was gunned down , they were unable to save him , as too much of his blood had been lost , leaving a red stain among Hoth ' s snow . Personality and traits . Trey Callum , like many Rebel specialists , defected from the Imperial Military . He was an expert at stretching the Alliance ' s meager resources , particularly at rationing supplies and making the most of the Alliance ' s small weapons stockpile . He had light skin . Equipment . During the Battle of Hoth , Callum wore the standard cold - weather armor of the Echo Base field troops , including the set ' s headgear , anti - glare goggles , scarf , padded vest , thermal flak jacket , gloves , leggings , boots , and backpack . He utilized TD2 . 3 electrobinoculars and a wrist comlink to identify and report , respectively , the presence of AT - AT walkers . Behind the scenes . Notable appearances . Trey Callum appears in the 1980 film as the Rebel trench officer who first reports to Echo Base the sighting of AT - ATs during the opening stages of the Battle of Hoth . Although uncredited , stuntman and swordmaster Bob Anderson portrayed the character in the film . Anderson is best known for his role as the Darth Vader fight double for actor David Prowse in lightsaber duels in both " The Empire Strikes Back " and . The character was first identified by name on the " Echo Base Trooper Officer " card from the November 1996 " Hoth Limited " expansion set of the " Star Wars " Customizable Card Game . The February 2004 article " Who ' s Who in Echo Base " , appearing in " Star Wars Insider " 74 , expanded on Callum ' s brief role at the Battle of Hoth , explaining the specifics of his inclusion in a chain of Rebel comlink calls that confirms the presence of Imperial walkers . The article was also the first source to confirm Callum ' s death in the battle . Callum is also featured in the video game " Star Wars Galaxies : An Empire Divided " , among its 2008 Battle of Hoth instance , in which players recreate the iconic battle from " The Empire Strikes Back " . The character appears briefly in a comm window , reciting his line from the film . " Star Wars Galaxies " depicts Callum as wearing his uniform ' s cold - weather headgear in a manner that completely covers his face , a departure from his presentation in the film . Character confusion . Trey Callum should not be confused with the character of Maren Kelsome , whom the 1996 second edition of the West End Games sourcebook identifies as the forward Rebel scout who reports to Echo Station 3 - T - 8 the first sighting of AT - ATs , which is then reported to Callum . Further confusion may arise over Callum ' s possible appearance in " The Empire Strikes Back " radio drama and the radio drama script , published in " " . During the film scene in which the Rebels first spot the AT - ATs on Hoth , the radio drama is alternatively set within the Echo Base command center , and the reports are heard over comlink . The command center receives a call directly from Echo Station 3 - T - 8 , and General Carlist Rieekan subsequently opens up communication with a young soldier , identified only as " Outpost Beta , " who nervously describes the giant size of the walkers , which Rieekan in turn confirms are AT - ATs . This young soldier is , in fact , Maren Kelsome , as confirmed by " Galaxy Guide 3 " , and , again , should not be confused with Callum , who is the third link in the chain of comlink calls from Kelsome and Echo Station 3 - T - 8 . Likewise , Callum should not be confused with a character narrative appearing in " Chapter Six : Ground Combat " from the 1990 first edition and 1994 second edition of the West End Games " Rebel Alliance Sourcebook " . The chapter introduction describes how " the advance scout on Echo Base ' s North Ridge [ who was ] the first to see the walkers " goes on to rescue a downed snowspeeder pilot once the last AT - AT passes his position . This description may also seem to correspond to Maren Kelsome ; however , any connection to either character represents a stark continuity inconsistency , since both Callum and Kelsome are dead by this point in the battle . Inconsistencies . The , a 2008 comic book adaptation using still images from the film , includes Trey Callum ' s scene announcing the approaching AT - AT walkers . However , the comic attributes the line " Imperial walkers on the north ridge " to Callum , which is actually spoken in the film by a public address voice in response to Callum ' s report . Similarly , the " Walker Sighting " card from the " Hoth Limited " " SWCCG " expansion set includes the quote " Echo station , 3TA . We have spotted Imperial walkers , " a corruption of Callum ' s actual spoken line from the film . " The Complete Star Wars Encyclopedia " , released in 2008 , uses the same production photo of a Hoth Rebel soldier from " The Empire Strikes Back " to illustrate both Trey Callum and Hoth soldier Reyé Hollis . However , the actor in the production photo is visibly different from stuntman Bob Anderson , who plays Callum in the film , and does not clearly correspond to the Hollis character either . Therefore , this article avoids making a judgment as to which character the production photo ' s actor is intended to be . While " Who ' s Who in Echo Base " , , and " The Empire Strikes Back " film script identify Callum as using electrobinoculars — specifically , Model TD2 . 3 electrobinoculars , as identified by the 2004 reference book " The New Essential Guide to Weapons and Technology " — to visually confirm the approaching line of AT - AT walkers , claims Callum uses macrobinoculars , a less expensive and more resilient visual - enhancement device . The 2001 video game " " explains that Outpost Beta troops are in command of the Echo Base v - 150 Planet Defender ion cannon during the Battle of Hoth , which would seem to imply that Callum , who is in charge of a squad of soldiers at Outpost Beta , is therefore in charge of the ion cannon in some form . However , a detailed Battle of Hoth field map illustration in " Galaxy Guide 3 " shows that Outpost Beta is the most distant Echo Base perimeter station from the ion cannon . Non - canon biography . The Trey Callum character inspired non - canon versions of the character ' s corresponding film scene in the 2006 video game " " and its accompanying subsequent release , " " . The games , which offer a humorous retelling of the " Star Wars " saga , feature a lead - in cutscene to the Battle of Hoth levels depicting a mustachioed Rebel officer , corresponding to Callum ' s role in the film , who keeps a lookout on the Echo Base defensive perimeter for approaching Imperial forces . After spotting AT - AT walkers through his electrobinoculars , the character pulls out a heavy blaster rifle and opens fire on the Imperial machines . The AT - ATs return fire and promptly blow the character away .