The British Army recruit has the option of discharging himself as well in the first few weeks of training. While that may weed out some the reality is that the British Army suffers very high wastage rates in training, primarily due to homesickness...

British Army recruits go through an extensive selection process once they have volunteered for service, including psychometric and physical evaluation; but there's no cure yet for homesickness.

Interestingly (worryingly) defence recruitment in the UK has just been outsourced. Understandably there are a number of concerns with this...