XENOMORPH TIMELINE
Aliens: Colonial Marines - No Man Left Behind is a comic released in 2012. Its story takes place around 2179, around the same time as Alien 3 (2179) and about 202 years before Alien Resurrection (2381). In the Legacy Alien timeline, it comes after William Gibson's Alien 3 (around 2179) and before Alien 3 (Game) (around 2179).
"No Man Left Behind" is a one-shot comic book published by Dark Horse Comics under the cover title "Aliens: Colonial Marines" and given away for free at San Diego Comic-Con in July 2012. Written by Joshua Williamson and drawn by Patric Reynolds, with a cover by Menton Matthews III, it is a tie-in to the Gearbox Software game released by Sega in 2013. The issue also holds a gallery of "Aliens" pin-ups.
The story takes place just before the game. A squad of Colonial Marines is fighting a horde of Xenomorphs when Weyland-Yutani's private soldiers arrive and kill Marines and creatures alike. Only the medic known as Doc and Private O'Neal are left alive.
Doc saves O'Neal from a group of Xenomorphs. Then the two men find a wounded company soldier who only wants to see his wife again, until a chestburster tears its way out of him.
Just before the events of the game "Aliens: Colonial Marines," Weyland-Yutani's private soldiers gun down a squad of Colonial Marines fighting Xenomorphs. Only the medic known as Doc and Private O'Neal survive.
Credits : Joshua Williamson (Writer) Patric Reynolds (Artist)