A close-up view of a cover over one of the windows on the Orion pressure vessel for NASA’s Artemis ll mission inside the Neil Armstrong Operations and Checkout Building high bay on Sept. 17, 2019. Orion is being prepared for the first crewed test flight atop the agency’s Space Launch System rocket. Artemis ll will lift off from Launch Complex 39B. The mission will confirm all of the spacecraft’s systems operate as designed in the actual environment of deep space with astronauts aboard.