Reading through this thread reminded me of the story of my wife's grandfather. Born in 1900, he actually landed at Gallipoli and survived the campaign, before being sent home after the Army found out his true age. Somehow, he had managed to produce a fake birth certificate and apparently looked older than 15 at the time.
Then, in 1939, he UNDERSTATED his age and re-enlisted, again to survive the conflict though not sent home this time round. Some blokes never learn - why in hell would you want to go round a second time when you didn't have to? Marriage must have been a bitch.
Between wars, he was the first Australian representative Rugby League player from the St. George Dragons, during the early 1920's. One interesting life, he had.