Question: Are San Luis Obispo County Regional Airport and Ketchikan International Airport both located in the United States?
Sentence (from "O'Sullivan Army Heliport"): O'Sullivan Army Heliport (ICAO: KCSL, FAA LID: CSL) is a U.S. Army heliport at Camp San Luis Obispo in San Luis Obispo County, California, United States.
Relevant evidence: No