Medicine (PCM). Air Division Royal Thai Army Aviation Center (กองบินทหารบกไทย) belongs to the service segment of the Royal Thai Army Areas: Don Mueang International Airport (VTBD) Units include the VIP squadron, flying two Embraer ERJ-135LRs (serial number 1084/HS-AMP and serial number 1124), two Jetstream 41s (serial numbers 41060 and 41094), two Casa 212–300s (serial numbers 446 and 447), and two Beech 1900C-1s (serial numbers 0169 and 0170) and the 1st Infantry Battalion operating two Bell 206Bs (serial numbers 4422 and 4448), three Schweizer S-300Cs (serial numbers 1340, 1366 and 1367), and two Cessna U-17B FAC aircraft (serial numbers 1616 and 1617). Bang Khen (3 km south of Don Mueang) The Royal Squadron flies three Bell 212s and two Bell 412s (serial numbers 36332 and 36333). There is also a special transport unit flying around 10–12 Bell 212s and one or two Bell 206s. Fort Surasi (Kanchanaburi) The 9th Infantry Division operates two Bell 206Bs (the serial number of one is 4424), and two or three Schweizer S-300Cs. There is also a detachment of UH-1Hs from an Air Mobility Company based here. Fort Chakraphong (Prachinburi) The "2nd Infantry Division, Queen Sirikit's Guard", was operating two Bell 206Bs (serial numbers 4446 and 4361), three Schweizer S-300Cs (serial numbers 1343, 1344, and 1345), and two Maule MX-7s (one serial number known is 099) in 2004, however it is likely the Maule MX-7s may now not be operated by this unit now. A detachment of this unit (with, in 1998, one Bell 206 and one Maule MX-7) was operating from Watthana Nakhon (VTBW) near the Cambodian border. Phitsanulok Airport (VTPP) Loc 16 degrees 46'58.58N,100 degrees 16'44.84E elevation 154 feet/47 metres. Runway 14/32 length 9,843 x 148 feet (3,000 x 45 metres) Operating from here is the 4th Infantry Battalion with Bell 206Bs, Schweizer S-300Cs, Cessna U-17Bs, and Maule MX-7s. Fort Suranari (Khorat) The main flying unit here is the 3rd Infantry Battalion flying two Bell 206Bs (serial numbers 4396 and 4447), two Schweizer S-300Cs (serial numbers 1337 and 1339), and two Cessna U-17Bs (serial numbers 1454 and 1618). This field also hosts a detachment of up to three Bell 212 helicopters from one of the Air Mobility Companies. Fort Princess Srinagarindra (Lopburi), the main base complex of Royal Thai Army Aviation, including training, technical school, aircraft maintenance, and aircraft storage. The main airfield here is called Sa Pran Nak (VTBH). Loc 14 degrees 56'58.02N,