Here are some exclusive behind-the-scene photos from the official Halo 3 publicity campaign in Singapore. These photos were discovered with the private blog of an adorable Singaporean model/booth babe, who is currently working for Microsoft to promote Halo 3 in Singapore.
Sheylara's blog (titled "The Sometimes Damsel in Distress") includes more exclusive behind-the-scene photos of Master Chief. You can read about many inside tidbits and the excitement of her promo gig for Microsoft. She also also confesses in her blog and YouTube videos that she is a big fangirl of Halo, Xbox 360, Wii, and DS. (But not so much for the PS3 - see Alternative Sources.)