Newport News Shipbuilding segment operating income 1 for the fourth quarter of 2021 was $95 million, a decrease of $33 million from the same period in 2020. Segment operating margin 1 in the fourth quarter of 2021 was 6.2%, compared to 7.3% in the same period last year. The decreases were primarily due to lower risk retirement on naval nuclear support services, including submarine fleet support. 1 Non-GAAP measures. See Exhibit B for definitions and reconciliations. For the full year, Newport News Shipbuilding revenues were $5.7 billion, an increase of $92 million, or 1.7%, from 2020, primarily driven by higher revenues in submarines and aircraft carriers, partially offset by lower revenues in naval nuclear support services. Submarine revenues increased primarily as a result of higher volumes on Block V boats of the VCS program and the Columbia- class submarine program, partially offset by lower volumes on Block IV boats of the VCS program.