The IDF, which in the early years of the State was extremely secular, today has a host of fully observant soldiers and officers even in or especially in the most elite, daring and dangerous units. Since the "first" Lebanese War, including those MIA missing in action, there's a higher percentage disproportionate amount of religious, or from religious background, among the casualties.
A photographic tribute to the IDF and those who were killed during this recent, unfinished war, gives a pretty accurate impression of today's Israeli army.
IDF soldiers who are religiously observant have been promoted to important positions without being forced to give up religious life. Today there are many mechinot, religious preparatory yeshivot, academies, that provide IDF sanctioned guidance for the religious soldier, whether new conscript or high ranking officer.
That's the big picture, thank G-d.