The team has a total of 13 pilots (selected from the fighter stream of the IAF) and operate 9 HAL HJT-16 Kiran Mk.2 trainer aircraft painted in a "day-glo orange" and white colour scheme. The Surya Kiran team were conferred squadron status in 2006, and presently have the designation of 52 Squadron (""The Sharks""). The team is based at the Indian Air Force Station at Bidar. The IAF has begun the process of converting Surya Kirans to BAE Hawks. "Sarang" (Sanskrit for "Peacock") is the Helicopter Display Team of the Indian Air Force. The team was formed in October 2003 and their first public performance was at the Asian Aerospace Show, Singapore, 2004. The team flies four HAL Dhruvs painted in red and white with a peacock figure at each side of the fuselage. The team is based at the Sulur Air Force Station, Coimbatore. Over the years reliable sources provided notably divergent estimates of the personnel strength of the Indian Air Force after analysing open-source intelligence. The public policy organisation GlobalSecurity.org had estimated that the IAF had an estimated strength of 110,000 active personnel in 1994. In 2006, Anthony Cordesman estimated that strength to be 170,000 in the International Institute for Strategic Studies (IISS) publication ""The Asian Conventional Military Balance in 2006"". In 2010, James Hackett revised that estimate to an approximate strength of 127,000 active personnel in the IISS publication ""Military Balance 2010"".  , the Indian Air Force has a sanctioned strength of 12,550 officers (12,404 serving with 146 under strength), and 142,529 airmen (127,172 serving with 15,357 under strength). The rank structure of the Indian Air Force is based on that of the Royal Air Force. The highest rank attainable in the IAF is Marshal of the Indian Air Force, conferred by the President of India after exceptional service during wartime. MIAF Arjan Singh is the only officer to have achieved this rank. The head of the Indian Air Force is the Chief of the Air Staff, who holds the rank of Air Chief Marshal. Anyone holding Indian citizenship can apply to be an officer in the Air Force as long as they satisfy the eligibility criteria. There are four entry points to become an officer. Male applicants, who are between the ages of 16 and 19 and have passed high school graduation, can apply at the "Intermediate" level.