Global Conscription: http://en.wikipedia.org/wiki/Conscription
Global Reservists: http://en.wikipedia.org/wiki/Reservist
National service is a common name for mandatory
or volunteer government service programmes (usually military service, also known as
conscription). The term became common
British usage during and for some years following the Second World
War. Many young people spent one or more years in such programmes.
Compulsory military service typically requires all citizens, or all
male citizens, to participate for a period of a year (or more in
some countries) during their youth, usually at some point between
the age of 18 and their late twenties.