I know about buck and abit about Locke from nightfall, I need to know about the other two members
Holly Tanaka first appears in issues 17 and 18 of Halo: Escalation as the protagonist of the ‘Glass Horizon’ story arc, while Olympia Vale’s first appearance is in the novel, Halo: Hunters in the Dark. Both are fairy interesting reads. Here’s the Halopedia links to each character if you just want an overview of what we know so far: