No One Left Behind

No One Left Behind is an achievement in Halo 4. It is awarded for saving at least one Marine in Chapter 3 of Episode 2 in Spartan Ops on Heroic or harder. The achievement is worth 20 Gamerpoints. It is represented by the number "2" inside a circle.

Trivia
The achievement was originally announced with the name "Rescue Ranger" on Halo Waypoint. This name may have been a reference to the 1980's children's cartoon Chip 'n Dale Rescue Rangers. By the time the game was released, the name was changed to "No One Left Behind".