Ieuan Wyn Jones, Plaid Cymru Assembly Member for Ynys Môn says that selling off the search and rescue service to a private contractor is "a step into the unknown."
Speaking following the announcement which will see the service move from Anglesey to Caernarfon.
The current search and rescue service operated by the RAF at Valley has been an excellent service for 70 years. It has saved hundreds of lives by rescuing people not only from the mountains of Wales but also those who have found themselves in difficulties around our coastline. This is a much valued service based at RAF Valley.
After winning the contract to take over search and rescue helicopter cover from the RAF, Bristow Helicopters have released details of the new fleet that will be deployed in April 2015.
There will be two helicopters at both its Welsh bases -Caernarfon Airport and the MOD site at St Athan near Barry.
Caernarfon's Sikorsky helicopters will cover an area of 250 nautical miles around the base and each carry three stretchers and up to 10 seated casualties. Augusta Westlands will cover 200 nautical miles around St Athan and each have room for two stretchers and six seated casualties.
All the helicopters will have a crew of four and be capable of flying at 145 nautical miles an hour.
The Department for Transport has signed a contract with Bristow Helicopters Ltd to provide search and rescue helicopter services in the UK.
The deal will see two helicopters based at Caernarfon Airport, and a new base will be set up at St Athan in the Vale of Glamorgan.
Our search and rescue helicopter service plays a crucial role, saving lives and providing assistance to people in distress on both land and on sea. With 24 years of experience providing search and rescue helicopter services in the UK, the public can have great confidence in Bristow and their ability to deliver a first class service with state of the art helicopters.