In the Australian military there is a cooling off period and you can do just that for the first few weeks. One person from my course signed up and never got on

In the Australian military there is a cooling off period and you can do just that for the first few weeks. One person from my course signed up and never got on the bus (changed his mind in like 3 hours). Another quit on the second day. If you AWOL in that first week or two they aren't going to waste resources chasing you, because they don't want you back anyway.