The United States Air Force's 303d Intelligence Squadron (303 IS) is an intelligence unit located at Osan AB, Korea. Also known as Skivvy Nine, the unit is housed at Osan Air Base, home of the 51st Fighter Wing, which comprises the 36th Fighter Squadron (F-16s) and the 25th Fighter Squadron (A-10s).Skivvy Nine occupies most of the KCOIC (Korean Combined Operations and Intelligence Center) C41 complex.