Aasif Olsen is a UNSC Marine and a member of Warbird Company. During the Requiem Campaign, Olsen and the rest of Warbird Company were stationed at the location known as "The Refuge." Although the base was supposedly secured,Covenant forces led by a group of Elites called the Silent Blade launched a sneak attack on Refuge. During the battle Olsen and his fellow marines were trapped behind an energy shield, preventing UNSC reinforcements from reaching them. SpartanFireteam Crimson eventually managed to deactivate the energy shield and rescued the marines.