Question: Which Air Force Base is based in Harrison County and stations the 403d Operations Group?
Sentence (from "Keesler Air Force Base"): Keesler Air Force Base (IATA: BIX, ICAO: KBIX, FAA LID: BIX) is a United States Air Force base located in Biloxi, a city in Harrison County, Mississippi, United States.
Relevant evidence: Yes