Read the following premise and answer if the hypothesis is true.
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. It is located just off California State Route 1, northwest of the city of San Luis Obispo, about halfway between it and Morro Bay. O'Sullivan AHP has one helipad designated H1 with a 2,430 by 75 ft (741 by 23 m) asphalt surface.
Hypothesis: The Heliport is also used by the Air Force.. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
It's impossible to say
It's impossible to say.