And what their function was on Virginia-class submarines?

Source: https://seekingalpha.com/article/4575676-graham-corporation-ghm-q3-2023-earnings-call-transcript?source=feed_all_articles

Australia plans to purchase between three and five US-made Virginia-class nuclear submarines as a stopgap measure before eight AUKUS-class nuclear submarines based on a British design are built in Adelaide, with the first to be completed by 2042.

Source: https://www.perthnow.com.au/business/defence-expert-says-aukus-deal-amounts-to-promise-to-follow-us-into-war-with-china-c-10081889

For the U.S. Navy, it primarily manufactures electronics systems, but it also has a partnership with Huntington Ingalls to produce the new Virginia-class of nuclear submarines.

Source: https://247wallst.com/special-report/2023/12/22/the-most-iconic-american-ship-and-submarine-manufacturers/

That includes the Virginia-class attack submarine, which is also built by General Dynamics and Huntington Ingalls, and has seen cost overruns and delivery delays.

Source: https://gcaptain.com/will-the-us-navys-new-submarine-miss-its-deadline/

The Virginia-class submarine docked at the HMAS Stirling port in Perth on Friday.

Source: https://thenewdaily.com.au/news/politics/australian-politics/2023/08/04/us-nuke-submarine-perth-visit/