NEW DELHI: A husband-wife combination of three-star generals is extremely rare. When Sadhna Saxena Nair was promoted to the rank of Air Marshal in the IAF on Monday, the Nairs attained that exceptional distinction.Air Marshal Sadhna Nair, a doctor who took over as the director-general of hospital services (armed forces) on Monday, joined her husband Air Marshal K P Nair, a fighter pilot who retired as...