It's called slavery, and it's a crime. Forcing someone to perform any kind of service against his will is slavery, and is a crime against humanity. Sexual slavery is popularly denounced these days, but military slavery is also quite popular, 'though just as wicked. So if the military is legitimate - and I'm assuming that it is, as it is being described as a military - then the soldiers have consented. If it is a slave army (and I agree there are legitimate reasons for claiming this) - or perhaps a military with embedded slave soldiers - slightly different rules would apply. But for the sake of simplifying the discussion, it's probably easier to discount the slave army component. If we want to talk slave army, that's another crime against humanity for the Israeli government.