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1° 9'50"S 136° 5'32"E Biak
- Komando Sektor Pertahanan Udara Nasional (Kosekhanudnas) IV - 4th Sector Air Defense Cmd. In charge of organizing and controlling all air defence ops in its area of responsibility
http://upload.wikimedia.org/wikipedia/id/1/16/Lambang_Kosekhanudnas_IV.png
http://www.kohanudnas.mil.id/images/satrad/1412043623kosek4.png ,

Subordinate units:
-- Radarstations 241 (Buraen, Timur); 242 (Tanjung Warari, Biak); 243 (Timika, Papua); 244 (Merauke, Papua) and 245 (Saumlaki Maluku)

Unit 252 Radar Ngliyep, Malang, East Java
Unit 253 Radar Jombang, East Java
Unit 255 Radar Balikpapan, East Kalimantan
Force Radar Kuandi 256, Gorontalo
Force Radar 257 Tarakan, East Kalimantan

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