A DRUG rehabilitation centre has been forced to ask the military for help building accommodation because the Government is refusing to pay. Soldiers from the Queen's Gurkha Engineers are building a new block for the second year on Town Island, south of High Island reservoir, with the help of the Royal Air Force. The structure will boost the capacity of the Operation Dawn rehabilitation centre for heroin addicts from 50 to 70. The centre is run by the Reverend John-Paul Chan of the Beautiful Gate Baptist Church in Kowloon. Mr Chan said he was grateful for the military assistance, but would prefer government funding to allow the group to help itself. 'The Government has said it needs time to evaluate what we do,' he said. 'It has been using us for years, how much more time does it need? If they don't know what we do, why are they using our centre?' Mr Chan said the addicts were all volunteers, but many had been sent by social workers through the probation service. Operation Dawn, which moved to disused fishermen's cottages on the island in 1976, was granted a Crown lease for a nominal rent. It is one of nine religious groups which run drug rehabilitation centres across the territory for about 500 addicts. The centre runs on about $1 million a year in donations and provides religious education for local and overseas addicts, some of whom have paid their way to Hong Kong for the year-long programme. A spokesman for the Government's Narcotics Division said it was examining granting charitable subsidies, but could not say how long the process would take. Eighteen members of the 67 Gurkha Independent Field Squadron are building the dormitory block and upgrading a dam. Tze Sum, 66, a heroin addict for 45 years and an opium addict before that, said he had been in dozens of rehabilitation centres but this time, he said, he had kicked the habit for good.