Halo: Landfall
From Halopedia, the Halo wiki
The Halo Shorts refer to a group of short live action films created in collaboration with Bungie Studios, Neill Blomkamp, WETA Digital, and Origami Digital LLC. These films were the Halo Franchise's first foray into live action films, followed colosely by the Museum series of films, the Halo shorts are intended to give both fans and sponsors a preview of what the Halo Movie could look like, should production be resumed.
Timeline
Kept under tight wraps, the set was announced unexpectedly on July 10, 2007 with the release of the first video, Halo: Arms Race on the front page of Bungie.net. Arms Race featured several shots of characters as well as special effects and set props, but little real action. The film was also shown at E3 2007, and with it came promises of additional shorts.
Arms Race was followed up with another film one month later, Combat, released on WETA's webiste in August 2007[1], telling the story of two ODST troopers fighting off Brutes while trying to retrieve an object on the battlefield during the Second Battle of Earth.
A third film, Last One Standing, was released on November 24, just hours before the release of Halo 3. This film was released first on the Discovery Channel's website, as part of their promotion for an unrelated show, Last One Standing[2]. This film continued the story of the two ODSTs in Combat, featuring more weapons, special effects, and live action combat between the Marines and Brutes, ending with the sight of a fireball descending into the atmosphere, a scene which is the beginning for in Halo 3.