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basement and the motor pool. More of these fuel tanks can be found on the level Sierra 117, albeit obviously not rigged up as bombs. After the cutscene where Johnson

Collection. It is unlocked by beating the 15 minute par time on the level Sierra 117. The achievement is worth 10 Gamerscore and can be unlocked on any difficulty

eventually unlock while fighting with him, and can be obtained as early as Sierra 117. The achievement is worth 5 Gamerscore.

becoming the Sierra Troopers, with the task of protecting the Sol system from the Auspex Empire, who also seeks to claim the Dynam Rings. Each Sierra Trooper

the original game, it is worth 20 Gamerscore and is unlocked by beating Sierra 117 from the start of the mission on Normal, Heroic, or Legendary. In the

Chief Collection. It is awarded for collecting the Blind skull in Halo 3 on Sierra 117. The achievement is worth 5 Gamerscore. Go to the area where you first

Chief Collection. It is obtained by finding the first Caveman on the level Sierra 117. The achievement is worth 5 Gamerscore. The first Caveman can be found

and viewing the "family" of four Cavemen, or "missing links", on the level Sierra 117. The achievement is worth 5 Gamerscore. To find the cavemen family,

when a player finds the lonely caveman easter egg near the end of the level Sierra 117. The achievement is worth 5 Gamerscore. The lonely caveman is in the

entrance to Crow's Nest, shown in Sierra 117's last cutscene. <span class="error">Expansion depth limit exceeded In Sierra 117's last cutscene, Hocus's Pelican

Chief Collection. It is awarded for collecting the Iron skull in Halo 3 on Sierra 117. The achievement is worth 5 Gamerscore. Battle through to the level

extract John-117 from the landing zone and take him to rally point Alpha-Sierra-Foxtrot, where John-117 would lead a group of Spartan-IVs to take back Infinity

Hybrid sight configuration of BR85N battle rifle favoured by Joint Task Force Sierra was undergoing evaluation by the Ordnance Commission in this year. ARGONAUT-class

combat armor per STOLEN GAUNTLET—a red alert failsafe in the event that any Sierra asset were to operate subversively outside mission parameters and operations

explode due to methane's high flammability. It is noted in the Halo 3 level Sierra 117 that the Jiralhanae may have added some form of addictive gas, possibly

Halo 3: Original Soundtrack, and plays during the Halo 3 campaign level Sierra 117. It is composed of Released (0:00-2:20), Wild Life (2:20-3:22), and

it to be some sort of laser sighting device. He sights the fireball, and "SIERRA 117" appears on the display in the sight. Their mission accomplished, the

used as the name of the first chapter of the second Halo 3 campaign level, Sierra 117. Rooster Teeth: Overshields are for Sissies & Walk it Off Achievement

one, take its Beam Rifle, and snipe the Jackals or Brutes in the area. On Sierra 117, a Sniper Rifle can be obtained at the crashed Pelican. It can later

protagonist of the Halo series, see John-117. For the Halo 3 campaign level, see Sierra 117. 117 is the twelfth track of the Halo 4: Original Soundtrack. It serves