Rob Howley and Robin McBryde have named their sides for Friday's Probables v Possibles senior trial.
England-based players including Gavin Henson, Paul James and George North miss out, leaving Henson's hopes of a Wales return looking slim.
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The squadron is being disbanded as part of the Army's response to the Government's Strategic Defence and Security Review.
Andrea Byrne presents the third episode of Helimeds following the helicopter crews of the Wales Air Ambulance.