While the Army has started conducting exercises with the UK forces recently, the two countries have been engaged in Navy and Air Force exercises for the past few years. The latest round of maritime engagements took place in April and featured frontline warships of the Royal Navy including the Illustrious Aircraft Carrier and the HMS Trafalgar nuclear submarine. Earlier in July 2007, IAF’s latest SU 30 MKI fighters took part in the Indo-UK ‘Indradhanush’ at the Royal Air Force (RAF) base at Waddington.