Hi wondering if anyone can help ? . My son is 17 and had been for his army medical and has had a defurel due to his peek flow , we have seen seen several doctors and medical people regarding this matter , my sons doctor has stated there is no medical reason why my son cannot join the army as he is physically fit and very health , the problem is he technique with the peek flow , as the doctor has stated some people just cannot use the machin and gives an incorrect reading due to tecnique , my son has been training for last 18 months to joint the army and is now feeling like his dreams are shatterd can anyone help ?