I am no fan of conscription. However I cannot deny the benefits of compulsory military service have on the society.
1. Literacy: Modern army relies on tactical superiority more than numbers. Hence in order to make any productive use of any recruit, a lot of time, energy and efforts have to be spent to educate and train them. A boom in disguise for the country whose 1/3 of the population still cannot read/write.
2. Discipline: Every army takes great pride in the discipline it creates. Countries like Israel, Singapore, South Korea enforce this training in the late teens/early twenties. This is the time when the maturity kicks in and army creates the best environment to control it and channelize it for the good of the society. This makes them more dedicated, better in organizing themselves, following order without creating chaos even under little/no supervision.
3. Vocational training: Indian educational system (esp. college) is often criticized for draining the prime years of a youth’s life without imparting much which will make him/her employable. Armed forces on the other hand teaches you skills to operate/maintain machinery/electronics and encourage troops making modifications to make them better.