Ok, I understand that you must do at least the first 4 weeks, then up until the first 6 months you can give 2 weeks notice to leave. Its after the first 6 month that Im a little unsure of. Ive heard from some sources that it is 2.5 years, but others that it is 3.5 years. Also is the return of service from the point when you finish basic training OR from the point when you finish professional training? I understand 12 month notice must be given at this stage, correct? Another thing some sources say initial length of service will be 12 years yet others say 18 years?