Israeli National military service is mandatory for any non-Arab Israeli citizen (as well as for Druze men) over the age of 18, although other exceptions may be made on religious, physical or psychological grounds.
During 1950-66, Israel spent an average of 9% of its GDP on defense. Defense expenditures increased dramatically after both the 1967 and 1973 wars. They reached a high of about 24% of GDP in the 1980s, but have since come back down to about 9%,[12] about $15 billion, following the signing of peace agreements with Jordan and Egypt. In 2008, Israel spent $16.2 billion on its armed forces, making it the country with the biggest ratio of defense spending to GDP and as a percentage of the budget of all developed countries.($2,300 per person)
reference taken from :
hxxp://en.wikipedia.org / wiki/ Israel_Defense_Forces