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- "A hero need not speak. When he is gone, the world will speak for him."
- — Magazine Ad
Believe is a Microsoft marketing campaign for Halo 3 produced by New Deal Studios. It features the word "Believe" as a tagline, and appears to be honoring the legacy of SPARTAN-117, citing him as a hero of the United Nations Space Command whose brave actions inspired other servicemen during the Human-Covenant War.
It includes handouts, live-action TV commercials, magazine page advertisements, and XBOX live marketplace ads.
(Note the Websites are defunct now. Anything that can be found is either on its relevant page or on this page)
- Diorama - An interactive flash movie, a part of the Believe campaign for Halo 3. It is a fly through of the John-117 Monument, and was be viewed at the Halo 3 website.
- On Xbox.com, there was a collection of photographs from war photographer Jake Courage titled "Shooting a Hero".
- Museum - A live-action TV commercial featuring Retired Major Pawel Czernek, a UNSC veteran that fought in the Battle of New Mombasa alongside SPARTAN-117, reminiscing of his memories of the inspiring hero.
- Hunted - A live-action TV commercial.
- Enemy Weapon - A live-action TV commercial.
- Gravesite - A live-action TV commercial that explores the battleground and talks of Spartan 117's "death".
- Believe: The John 117 Monument - A live-action online video, describing the in-universe construction of the memorial diorama.
- Shooting a Hero - A trailer detailing the photos of John-117 that Jake Courage took.
- Believe - A pamphlet distributed at the Project Revolution musical festival, featuring in-universe musical presentation of the UNSC Symphony Orchestra.
- Believe Plaques - Plaques were displayed in several locations. The dates on some of these plaques are canonically incorrect, describing Human-Covenant War events involving John-117 happening in mid-2553 and later, despite the fact that the war had ended and John was Missing In Action by that time.
- Art Galleries - Several photographs were shown in art galleries in the UK that were photos by Jake Courage.
- The creators of the campaign were not informed of the story of Halo 3, leading to multiple inconsistencies with the narrative depicted in Believe and the game's story. The diorama presents a very loose representation of the Battle of New Mombasa, the most prominent contradiction with the actual events being the Master Chief's capture by a Brute Chieftain and his supposed self-sacrifice by detonating a plasma grenade. Because of these discrepancies, the Believe campaign can be understood as a cover-up operation performed by ONI Section Two to cover up the truth about the Forerunners, the Halo Array, and the Flood from the general public whilst providing a fictionalized explanation for the Master Chief's disappearance.
- Stan Winston Studio was responsible for the diorama featured in the Halo 3 Believe ads.
- The melody that was used in the Believe commercials was created by Polish pianist Frédéric Chopin and is called "Preludes #15, Raindrop".
- In the Halo 3: ODST campaign levels Mombasa Streets and Tayari Plaza, there are several graffiti where the player can read BELIEVE, a reference to the Halo 3 marketing campaign.
- There is one particular area in Mombasa Streets though that has 117 in bullet holes next one of the BELIEVE graffiti.
- A new trailer released for the game Serious Sam HD entitled "Seriously Believe" is an obvious tribute or parody to the Believe campaign, utilizing a selection of frozen in-game views in place of the models, a similar track, and a black screen at the end with the words "Seriously Believe" appearing, very similar to the original "Believe" trailer.