Halo 3 E3 Reveal

Halo 3 - First Announcement Trailer [HD] - E3 2006

E306 - Halo 3 trailer from The Microsoft Briefing

Halo 3 CGI Trailer - "Starry Night" (Superbowl commercial) [HD]

Halo 3 E3 2007 Trailer

Halo 3: Believe

Xbox Canada presents: Halo 3 ODST Live Action Trailer "The Life"

Halo 3: Starry Night

Halo 3 Gameplay Trailer - E3 2007

Little English Halo Blog

Halo E3 appearances with crowd reactions

Halo 3 Announcement Trailer (Highest Quality)

Halo 3's Original E3 2006 Reveal Remastered in 60FPS

Halo 3 Xbox 360 Trailer - E3 2007 Live Action Trailer (HD)

IGN

Halo: Reach E3 2009 Teaser Trailer

Halo 3 - The Midnight Launch

Reid Nicewonder

Halo 3 E3 2007 Trailer (Remastered on MCC PC)

Halo 3 - Never Before Seen POV Of The E3 2006 Trailer

Halo: The Master Chief Collection E3 Trailer

IGN

Halo Wars 2 Official E3 Trailer

Xbox

Halo 3 - E3 2007 "Official Trailer 2" [HD]

TGS 2008: Halo 3: ODST Trailer (a.k.a. Recon)

IGN