When one joins the ADF here, one joins for 6 years because nine months isn't long enough to learn a category. For instance, one of my friends joined and did basic then spent three years learning her job (cryptologic linguistics) learning another language along the way and will then spend three years doing it. They will ask her to re-up and offer her a chunk of tax free money to do so (about $70,000) before the end of the total six years.
Anyway, other countries do it differently I guess.