This is an important point to note i.e. there is no LEGISLATIVE reason why the Arabs can not be called up for military service. Barak can call them up tomorrow, and if they receive that call-up then they must report for duty. They don't serve for one reason only: this Minister of Defense (as all previous Ministers) simply refuses to call them up.
17-year-old Palestinian killed by IDF on Friday laid to rest near Ramallah (Haaretz)
from the article: Arabs, Haredim aren't the solution to Israel's woes