They're In The Army Now -- This months 10,000 Aus?tralian mothers will be without their sons, away for National Service training in the Army, Navy and Air Force. They will be the first batch of 50,000 18-year-old youths who will be called up for this purpose, probably in the next year. Their periods of training will range from 14 weeks for the Army. to 17 weeks for the Navy and 25 weeks for the Air Force. Many of these youths, from all walks of life, will be living away from home, away from dire