john donkin

I have recently received my deceased Brothers medals after the death of his only son. Here I found a UN shoulder patch and the UN White enamel cap badge. He served two tours at Seletar, Kai Tak and in the New Territories . I am now wondering where and when he served with the UN forces? His records show that he was posted to Honolulu at the time of these tests. Might this be the solution? Can anyone enlighten me?