WE BF, yes, any time. Usual rules, serial number, ship, and if possible dates.
In my father's case I could find no record of any ships that he sailed on being involved though from what he told me, I was about 6-7, he might have been. I asked and the answer was no he wasn't. He was Merchant Navy. I applied for my mother-in-law for her late husband. It came through quite quickly.