Senior Airman Jason Yumen, a radio frequency technician for the 169th Air Defense Squadron, briefs 15th Wing and Hawaii Air National Guard leaders on the mission of the 169th ADS during a tour of the Mount Kaala Air Force Station, Hawaii, Dec. 4, 2015. With an elevation of roughly 4,000 feet, Mount Kaala Air Force Station is the heist point on the island of Oahu. (U.S. Air Force photo by Tech. Sgt. Aaron Oelrich/Released)