That is Rav Shlomo Aviner, rosh yeshiva of Ateret Kohanim and formerly rav of Bet El among other communities. 

At 80 years old Rav Aviner joined the IDF Reserves and put on his uniform and went to strengthen the soldiers and give chizuk. I assume he is serving, if in an official capacity, in the IDF Rabbinate.

According to Wikipedia Rav Aviner as a younger man served in the IDF partaking in both the Six Day War and the Yom Kippur War rising to the rank of Lieutenant.

Be Safe and Godspeed!

------------------------------------------------------
Reach thousands of readers with your ad by advertising on Life in Israel

------------------------------------------------------