A brother I knew here in the UK was called up when he was 18 about 1959 as I recall. He was sent to prison (Lincoln) for 3 months with the option of a £50 fine instead. Taking the fine was not allowed so he did his 3 months. He had only been released a few weeks when he was called up again and the same thing happened, 3 months or £50 fine. The cell door must have barely been closed when he was sent home, an "anonymous" donor had paid his fine. Everyone knew it was his employer who did want this guy off for another 3 months as he was such a good worker. Alternative service was never mentioned.
George