Graphic Novel
Published as Empire -
Volume 7: The Wrong Side of the War.
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These stories are included in:

Omnibus: At War with the Empire - Vol.2
(Model Officer)

and

Omnibus: The Other Sons of Tatooine
(The Wrong Side of the War)

Comic Book series
Published September 2005 thru March 2006 as Empire #35, 36, 37, 38, 39 & 40 by Dark Horse Comics:

Issue #35Issue #36

Issue #37Issue #38

Issue #39Issue #40

e-Comic Books
Published 2012
by Dark Horse Digital.

Synopsis:
This book collects together the following comic stories:

• Model Officer
  Information obtained from a prisoner captured on Jabiim has set Darth Vader on the trail of the Rebel Fleet. No Alliance defense can divert Vader from his target, and if he is successful it will mean the destruction of the fleet and the end of the Rebellion.
  But there is one small hope for the Rebels, and it all comes down to one man pursuing his duties with an unshakable zeal, and remaining a "model officer" to the end...

• The Wrong Side of the War
  Fresh from the killing fields of Jabiim, where the Empire has virtually wiped out the populace of that world, Imperial Lieutenant Janek Sunber is sent to the quiet prison base on Kalist VI. But, unbeknownst to the Empire, the Rebels have designs on Kalist Base both for its desirable fuel supplies, and for the presence of a very important prisoner-one of their own who has already attracted the interest of Darth Vader.
  Sunber doesn't know it, but he's on a collision course with an old friend who is with the Rebels, and he finds himself wondering which of them is on the wrong side of the war.
  Devotion to duty has put Imperial Lieutenant Janek Sunber once more on the front lines. First as part of an intense ground battle, where the last of a planet's freedom fighters are desperately holding on, then as a glorified prison guard at an Imperial base where prisoners are put to work for the benefit of the Empire. It's not the career Sunber imagined he'd have in the Imperial Infantry, but a Rebel surprise attack on the base may give Sunber another chance to distinguish himself--or die trying!
  In his new post as prison guard at the Imperial base on Kalist IV, Lt. Janek Sunber is forced to weigh what he knows he should do against what he can do when he comes up against the corrupt status quo. But conflict with his fellow officers is just the tip of the iceberg when it comes to challenges facing the young lieutenant. Unbeknownst to the Empire, the Rebels have infiltrated the base!
  Dissent in the ranks! Janek Sunber finds himself at odds-and at gunpoint-with his fellow officers over the treatment of Imperial prisoners. Hardly an auspicious start to his new assignment, and made all the worse because the internal conflict blinds the Imperials to the presence of Rebel infiltrators in their midst! But the biggest shock to Sunber-and the Rebels-is yet to come, from a most unexpected quarter! Allegiances are strained, identities are revealed, and a major strike against the Empire is in the offing.
  Inside the Imperial base on Kalist VI, an undercover Rebel strike force is on a mission vital to the continued existence of the Alliance. Everything has gone according to plan, but the one eventuality for which no one could have prepared is the presence of Imperial Lieutenant Janek Sunber-or how his presence will impact the Rebel team. Duty to the Empire has asked much of Sunber and offered little in return, but he has never wavered in his dedication. Now, a shocking discovery has landed him at a crossroads, and the time has come for him to decide whether to devote himself to order, or justice.
  The jig is up!
  The Rebel intelligence operatives inside the Imperial base on Kalist VI have been discovered. Yet, even with their cover blown, this stalwart crew of Alliance heroes is determined to follow through with their mission no matter what the cost! As Imperial forces close in swiftly and mercilessly, will this band of Rebels need to be rescued from their own rescue mission?

Related Stories (in chronological order):

• Last Stand on Jabiim by John Blackman et.al.
• A New Hope
• To The Last Man by Welles Hartley et al.
• In The Shadows Of Their Fathers by Thomas Andrews et al.
• The Wrong Side of the War
• My Brother, My Enemy by Rob Williams et al.