According to the research I did. Those who go to the IDF via the Hesder programs of the Yeshivot Hesder hardly ever go OTD in the IDF . The percentage of OTD in that group is way less than those that go OTD in regular Yeshivos — and yes many of those (who are OTD from regular Yeshivos) will go to the IDF and move even further away.
Those that enroll in the IDF without being in a Hesder program ARE more likely to go OTD because they already have lower standards.
If one thinks about it a little deeper it is obvious that for Hesderniks the IDF is a chelek of their Yiddishkeit and with the arrangements made with the IDF it works well.
