Joint Base Charleston said on Facebook that the aircraft was a Lockheed Martin F-35 LightningII belonging to Marine Corps Air Station Beaufort.

Source: https://www.samfordcrimson.com/f-35-jet-reported-missing-by-authorities-after-pilot-ejects-during-mishap-officials-2023-09-18.html

The neighboring Air Force installation, a part of Joint Base Charleston that owns the runways, accounts for 44.5 percent, or $2.24 billion, of the total.

Source: https://www.postandcourier.com/business/charleston-airport-a-4-5b-economic-pillar-of-sc-study-says/article_197e793c-ae1a-11ed-b26c-bf11e502bcc9.html

The pilot landed on a cut-through street near the Midland Park and Stall roads and an entrance to Joint Base Charleston, where single-story homes are ringed by drainage ditches and chain-link fences.

Source: https://www.postandcourier.com/news/search-area-expands-across-sc-for-missing-f-35-fighter-jet/article_de94c536-561d-11ee-9262-bffa1e188902.html