The B-2 Spirit, the world’s most expensive bomber, costs over $2 billion per unit. With its flying wing design that makes it nearly invisible to radar, this aircraft requires meticulous maintenance. Watch this rare footage of its upkeep. Click here to Subscribe USA Military Channel: https://www.youtube.com/subscription_center?add_user=UsaMilitaryChannel The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement.