Master Chief, Halo 3, campaign missions, sci-fi armor, green visor, assault rifle, dynamic action pose, alien landscape, Forerunner structures, Covenant enemies, Grunts, Elites, Brutes, Banshee aerial combat, Warthog driving, Cortana AI hologram, Flood infestation, space opera, epic battles, ringworld, Halo installation, firefights, plasma explosions, energy sword, tactical maneuvers, UNSC Marines, heroic stance, salvation mission, interstellar war, high-contrast lighting, cinematic angle, 3/4 view, detailed textures, advanced alien technology, atmospheric effects, smoke, debris, dramatic sky, sunset illumination.