sentences:  Starting in 1971, Bristow Helicopters began providing civilian search and rescue (SAR) services in the UK, replacing military Westland Whirlwinds with Bristow-operated Sikorsky S-55s at RAF Manston, Kent.The then-unfamiliar concept of using a private company for SAR services led to a public outcry and intense lobbying efforts thus, after three years, operations were turned back over to RAF Coastal Command.Bristow reentered the UK's SAR sector in 1983 when it commenced operations on behalf of the Maritime and Coastguard Agency (MCA) from Sumburgh Airport; the company held the contract until 2007 and secured it again in June 2013.