It had an Officers' Club aboard, housing a large table of oak, which was heavily scored with numerous gouges and scorches from cigars set upon its surface. There was also a bar stocked with a number of varieties of liquor. It also housed s gold-fringed blue UNSC flag, photographs of past officers and captains of the Gettysburg, and a tin Civil War daguerreotype that displayed battlefields of charging men, cavalry and cannons.
 Battle of Sigma Octanus IV
- Main article: Battle of Sigma Octanus IV
On July 17, 2552, the Gettysburg, along with the frigate UNSC Allegiance, responded to a distress signal sent by Commander Jacob Keyes from the Sigma Octanus System. The vessel later fought in the Battle of Sigma Octanus IV with Battle Group Leviathan.
 Gettysburg-Ascendant Justice
Eventually, John-117, along with several survivors of Battle of Installation 04 and Fall of Reach, used the Gettysburg, fusing it with the Covenant ship Ascendant Justice, thus becoming the first human-Covenant hybrid vessel in history. It was used because the Ascendant Justice could not do the two Slipspace jumps in and out of a group of Covenant ships fast enough using just its own reactor. 
 Operation: FIRST STRIKE
- Main article: Operation: FIRST STRIKE
Eventually, the vessel was unlinked from the Ascendant Justice so that Vice Admiral Danforth Whitcomb and First Lieutenant Elias Haverson could use the Ascendant Justice to lure a Covenant battle fleet to the Unyielding Hierophant, which was about to explode. The Gettysburg was refitted with the slipspace drive from the Ascendant Justice prior to unlinking. After Operation: FIRST STRIKE, the Gettysburg and its skeleton crew headed back to the Sol system.
Gettysburg is named after the Battle of Gettysburg, the American Civil War battle that took place on July 1-3 1863, in Gettysburg, Pennsylvania, on Earth. This is interesting, in that it was fused with a Covenant vessel, just as the two factions of the American Civil War eventually rejoined into one country.
 List of appearances
- ^ Halo: The Fall of Reach, page 145
- ^ Halo: The Fall of Reach, page 154
- ^ Halo: First Strike, page 208
- ^ Halo: First Strike, page 209
- ^ Halo: First Strike, page 332
- ^ Halo: First Strike, page 329