In my early days, C of E, RC and OD - Other denominations. The latter, by the time I rejoined in 1980, had become CSFC - Church of Scotland and Free Churches. And as to the order for falling out, who else remembers the CWO at Cranwell, (the ginger-haired one before Johnny Garbett, and whose name escapes me) in about 1964 giving the order on parade "Roman Catholics and other Non-Christians, Fall Out!". Titters in the crowd.