Anyone setting out on such a career is aware of the legal requirement to undertake service in the armed forces. There is absolutely nothing to stop them doing it before they start their career. There are plenty of jobs where it is inconvenient to have to take an extended break. Anything relating to technology or research, for example, where there is a need to keep up to date with the latest developments in the field is fairly unforgiving of such a break and so people build their careers around it, knowing that at some point they will be out of the loop for 24 months or so.  To suggest that it is more important that a pop star is able to keep on recording but that it is for scientist and technicians in the most wired country in the world to keep up with changes in technology is as inconsistent as it is unfair. The case of the performer is clearly weaker it’s simply that they have the status and fame to mean that they can make a big fuss about it and people will notice.  Whatever the vanity of celebrity may suggest it’s just another job and it’s questionable as to how much benefit it actually provides to society at large.  Further pandering to that vanity by suggesting that society can’t cope without a particular singer or actor for two years is ridiculous. There is no shortage of people wanting to do the job.