All requirements for this were dropped in 1960 I believe in the UK. It was an 18 month requirement for all men 18 years old and then went to a 2 year requirement just after it started. I know a few people who did that. My Dad missed it by several years though.
I am not sure if I would enjoy going to be honest. It sounds interesting the skills learned but at the same time I still dont think it would be too much fun
